AnankeUsing a telescope at Mount Wilson Observatory, astronomer Seth Nicholson discovers Ananke, a tiny moon of Jupiter orbiting the huge planet at an average distance of 21 million miles and at a high inclination relative to Jupiter’s equator. Ananke is most likely a captured asteroid or the remnant of a captured asteroid, and other small Jovian moons in the same orbit may be other pieces of the captured (and shredded) body. Ananke is the first Jovian moon discovered in nearly two decades, and it will be over two more decades before another is found.

The Thousand Foot Radio Telescope

AreciboAfter months of lobbying the U.S. Air Force and the Advanced Research Projects Agency (ARPA) for help in funding a large-aperture radar/radio telescope dish for studies of Earth’s ionosphere and the space that lies beyond, Cornell University’s Bill Gordon publishes a report in the journal of the School of Electrical Engineering. Gordon’s report, setting out the basic parameters for the project, includes a reflector dish diameter of one thousand feet – a daunting prospect from a structural engineering perspective. Sites in Texas and upstate New York are considered before a natural limestone “bowl” south of the city of Arecibo, Puerto Rico emerges as a promising candidate site.

Building Arecibo

AreciboProposed and designed by Cornell University, and funded by the Adavanced Research Projects Agency (ARPA), the Arecibo Ionospheric Research Center – a thousand-foot radar and radio telescope dish – begins construction in a natural limestone bowl south of Barrio Esparanza, Arecibo, Puerto Rico. Construction will take over three years, at a cost of nearly $10,000,000, with a steel feed receiver structure supported in mid-air over the parabolic dish by some five miles of steel cables. Facilities are constructed for scientists visiting the eventual facility, and additional facilities are constructed to shape aluminum into the mesh structure of the telescope dish on-site, a more economical approach than having those parts of the telescope shipped in from outside. Though conceived and pitched as a means of studying the ionosphere, with possible defense applications such as missile detection, the Arecibo facility will makes its best known contributions to astronomy after it opens.

Channel 37: all radio astronomy, all the time

Radio astronomyThe United States Federal Communications Commission places a ten-year hold on television station licenses for UHF channel 37. Channel 37’s bandwidth, in the 608-614 megahertz range, is vital to the burgeoning science of radio astronomy. The FCC immediately sets about reallocating channels on the UHF dial for 18 television stations across America, which had previously been allocated channel 37 on their licenses. One month later, the ban on broadcasting in that part of the spectrum is made global; no television station in the United States, Mexico, Canada, and several other countries will ever occupy those frequencies. When the ban comes up for review again in 1974, it will be made permanent, though a petition from radio astronomers to set aside channel 36 at that time will be denied.


AreciboNestled into a mountainous forest region of Puerto Rico, the Cornell University-funded Arecibo Radio Telescope officially begins operations. With a diameter of a thousand feet, this remains the world’s largest radio telescope until the 21st century. Studies of Earth’s ionosphere are high on the priority list, but radio astronomy isn’t far behind, and important discoveries are made at Arecibo within months of it opening.

Mercury’s shorter, but still very long, days

AreciboUsing the Arecibo Radio Telescope in Puerto Rico, a team of radio astronomers led by Gordon Pettengill makes the determination that Mercury rotates on its axis once every 59 Earth days, a much shorter “day” for Mercury than the previously estimated 88 Earth day rotation. Pettengill is a pioneer of radio and radar astronomy, and will go on to use both methods to study asteroids, Venus, and Earth’s moon.

Echoes of the Big Bang

Holmdell Horn AntennaUsing a 20-foot, horn-shaped receiver built at Bell Laboratories’ Holmdell, New Jersey facility for tests of the Echo-1 satellite in 1960, radio astronomers Arno Penzias and Robert Wilson stumble across the first sign of the Cosmic Microwave Background: a microwave signal indicating a 2.7 Kelvin background radiation emanating from every point in the universe, which Wilson and Penzias believe may be leftover radiation from the birth of the universe (confirming the “Big Bang theory” that had come about when astronomer Edwin Hubble discovered in the 1920s that the Doppler effect indicated that galaxies were moving away from each other). Though this monumental discovery will net the two a Nobel Prize for physics in 1978, Penzias and Wilson initially believe that the radiation is man-made or perhaps the result of pigeon droppings in the antenna interfering with their instruments!

Orbiting Astronomical Observatory

OAO-1NASA launches its first space-based telescope, the unmanned Orbiting Astronomical Observatory satellite, into Earth orbit. Weighing nearly two tons and sporting visible, ultraviolet, X-ray and gamma ray astronomy capabilities, OAO is in trouble mere minutes after it goes into service: a serious electrical failure leaves the spacecraft in a blind tumble, and it will be declared a loss three days after launch. NASA will attempt another OAO launch in 1968.


JanusFrench astronomer Audouin Dollfus discovers Janus, the tenth discovered natural satellite of the planet Saturn, orbiting just beyond the outer edge of Saturn’s ring. Confusion is caused when, mere days later, an American astronomer discovers another body in a near-identical orbit that cannot be reconciled with the orbit calculated for Janus. Only in the late 1970s will a theory emerge that explains the inconsistencies as the presence of two moons moving around Saturn as a co-orbital pair, occasionally swapping positions. Janus’ existence will be verified in 1980 by Voyager 1. (Janus is shown here in a 21st century Cassini photo.)


EpimetheusJust days after the discovery of a satellite in a near-identical orbit, U.S. Naval Observatory astronomer Richard Walker discovers Epimetheus, another natural satellite of the planet Saturn, again orbiting just beyond the outer edge of Saturn’s ring. Many of Walker’s fellow astronomers believe this is merely a second sighting of Janus, discovered mere days before, but irregularities in the computed orbits vex astronomers well into the 1970s, at which point it is conceded that the observations are best explained by two satellites in a very close orbit to one another. Epimetheus and Janus will next be spotted by Voyager 1 in 1980, conclusively proving the existence of two bodies. Epimetheus’ name won’t be made official until 1983. (Epimetheus is shown here in a 21st century Cassini photo.)

Arecibo and the Crab Nebula Pulsar

AreciboCornell University student Richard Lovelace, working at the Cornell-funded Arecibo Radio Telescope in Puerto Rico, uses the massive telescope and its on-site computers to determine the rotational period of a pulsar discovered near the center of the Crab Nebula, approximately 6,500 light years from Earth. The position of the pulsar relative to the nebula strengthens the case for pulsars and (still hypothetical) neutron stars occurring at the heart of supernova remnants. The Crab Nebula pulsar had been discovered only three years earlier.

Orbiting Astronomical Observatory 2: The Stargazer

OAO-1NASA launches the second Orbiting Astronomical Observatory satellite, given the nickname “Stargazer” after it successfully enters service. OAO-2 will remain in service for over four years, making significant contributions to the scientific understanding of comets and supernovae. Two separate experiments, including one designed and overseen by Dr. Fred Whipple, observe the sky in ultraviolet light from Earth orbit.

A near miss: the Great 1972 Fireball

Great 1972 FireballIn the broad daylight of mid-afternoon, an asteroid measuring somewhere between 10 and 50 feet in diameter plows through Earth’s atmosphere over North America, creating a long-tailed fireball across the sky. Undetected before its close pass – only 35 miles from Earth’s surface – asteroid US19720810 skips off of the atmosphere and back into space, having lost half of its mass to the frictional heating of plummeting through the atmosphere. The spectacle lasts only a couple of minutes, and US19720810 will make another pass by the Earth in 1997 (though not at such a close distance).

Orbiting Astronomical Observatory 3: Copernicus

OAO-1NASA launches the third and final Orbiting Astronomical Observatory satellite, given the nickname “Copernicus” when it successfully enters service near the 500th anniversary of the birth of the famed astronomer of the same name. OAO-3 is a joint venture between NASA and universities in the U.S. and the U.K., again focusing largely on ultraviolet observation of the sky, and it is instrumental in the discovery and study of long-period pulsars. OAO-3 will remain in service through February 1981, its successful nine-year mission lending weight to the ongoing construction and planning of NASA’s Space Telescope project, later to be known as the Hubble Space Telescope.


SAS-BNASA launches Explorer 48, renamed Small Astronomy Satellite B, from an Italian-owned offshore launch platform off the coast of Kenya. SAS-B is a smaller spacecraft than NASA’s larger Orbiting Astronomical Observatory (OAO) series, but can be aimed very precisely at any gamma ray sources that it detects. One of those sources turns out to be the pulsar remnant of a massive supernova, a discovery later named Geminga. An electrical fault will end SAS-B’s functionality in June 1973, and it will re-enter Earth’s atmosphere in 1976.


LedaAstronomer Charles Kowal discovers Leda, a tiny, previously undiscovered moon of Jupiter, using Mount Palomar Observatory’s telescope. With a radius of less than seven miles and an inclined orbit, Leda is the first Jovian moon discovered in over two decades, and is among the last to be discovered using ground-based telescopes in the 20th century.


SAS-BNASA launches Explorer 53, renamed Small Astronomy Satellite C, from an Italian-owned offshore launch platform off the coast of Kenya. SAS-C is a smaller spacecraft than NASA’s larger Orbiting Astronomical Observatory (OAO) series, but can be aimed very precisely at any cosmic X-ray sources that it detects. One of SAS-C’s discoveries is MXB1730-33, a binary star giving off rapid X-ray bursts. SAS-C will remain in orbit and functional until it re-enters Earth’s atmosphere in 1979.


ThemistoAstronomers catch fleeting glimpses of a new natural satellite of Jupiter, Themisto, though the initial estimates of its orbit are “off” enough that Themisto becomes “lost” and isn’t observed again until 2000. With a diameter of roughly five miles, Themisto marks the dividing line between the larger inner moons of Jupiter and the widely-scattered menagerie of asteroid-like outer moons orbiting the planet. Astronomers Elizabeth Roemer and Charles Kowal (who discovered another new Jovian moon in 1974) share credit for discovering the moon. Themisto is the last Jovian satellite to be discovered by ground-based telescope in the 20th century.

The Rings of Uranus

UranusA team of MIT astronomers, flying in a plane modified to serve as an airborne high-altitude telescope, plans to observe the planet Uranus as it eclipses, or “occults”, a star. But the team observes more occultations than expected both before and after the planet itself passes in front of the star. The inevitable conclusion is that Uranus has rings, made of material too dark to be detected by existing Earthbound telescopes. Further observations are given top priority: NASA’s Voyager 2 space probe, due to lift off later in 1977, may last long enough to reach Uranus, and the newly discovered rings must be taken into account when planning its flyby trajectory.


CharonAstronomer James Christy, conducting observations of Pluto at the United States Naval Observatory, discovers a bulging shape present in some photos he’s taken of Pluto, but absent in others. Though the find meets with some skepticism, he has discovered the largest moon of Pluto, Charon, which has a mass of over 50% that of its parent body. Orbiting at only 11,000 miles from Pluto’s surface, Charon has a radius of 750 miles. Within 20 years, closer telescopic examination (including observations using the Hubble Space Telescope) confirm that Charon is separate from Pluto. Since the two bodies are relatively similar in mass, one doesn’t actually orbit the other; rather, they both orbit a center of mass – a barycenter – that lies close to, but not within, Pluto. Further observations in the 21st century lead to the unexpected discovery of four further satellites of Pluto.


AdrasteaTiny Adrastea, a small, asteroid-like moon of Jupiter, is discovered in photos returned by Voyager 2 during its flyby of the planet. Adrastea orbits along the outer edge of Jupiter’s ring system, and is likely to be the body from which material for that ring is ejected. Its close orbit carries it around the planet at a speed faster than Jupiter’s rotation, one of the few bodies in the solar system locked into such a fast orbit.

Solar Maximum Mission

Solar MaxNASA launches the unmanned Solar Maximum Mission satellite atop a Delta 3910 rocket, to study cyclical solar flare activity from Earth orbit. Built by Fairchild and relying on a magnetic reaction wheel system to maintain precise aim at the sun, “Solar Max” suffers malfunctions in orbit, and will be able to carry out only limited observations by November 1980. In 1984, Solar Max will become the first satellite to be repaired in-orbit by a visiting space shuttle crew. After repairs, the satellite will be released, with its life span in orbit having effectively doubled. It will remain in orbit, and functional, through 1989.

The Chicxulub Crater Theory

BOOOOOOOOOMIn the journal Science, in an article titled “Extraterrestrial Cause for the Cretaceous-Tertiary Extinction”, Nobel-Prize-winning physicist Luis Alvarez and his son, geologist Walter Alvarez, propose their theory that the 110-mile-wide Chicxulub Crater discovered in the past few decades on the northern tip of the Yucatan Peninsula in Mexico is evidence of a large asteroid collision with Earth, resulting in the widespread death of the dinosaurs 65 million years before the modern day. A contentious peer review of the published theory follows, with many opposing theories proposed, though the Chicxulub hypothesis is eventually accepted as the “smoking gun” that killed the dinosaurs (the theory of an asteroid collision with Earth causing the extinction had been in circulation since the 1950s; the Alvarez theory is the first to point to a specific geological feature as evidence).

The disappearing moon of Neptune

LarissaA team of American astronomers discovers what they believe is a third moon of Neptune from ground-based telescope observations, but S/1981N1 isn’t seen again for several years, so the discovery is left in the “unconfirmed” category…until it is next seen by Voyager 2 in 1989, confirming the original sighting many years later. In 1991, the International Astronomical Union will name this moon Larissa. (Voyager 2 photo of Larissa shown)

Supernova 1987A

SN 1987AAstronomers both amateur and professional glimpse the first supernova to occur in the age of modern science. Given the name Supernova 1987A, the huge burst of light – visible to the naked eye in Earth’s southern hemisphere by the early summer months of 1987 before it begins fading out – is a collapsing star on the edge of the Tarantula Nebula. The star previously seen in that location is a blue supergiant, which wasn’t a likely candidate to go nova according to the existing theories of stellar evolution at the time. In the 1990s, the slowly expanding ring of debris rushing outward from Supernova 1987A becomes a favorite observation target for the Hubble Space Telescope. The supernova is more than 150,000 light years away from Earth’s solar system in the direction of the Large Magellenic Cloud.

Voyager 2 and the lost moon of Neptune

LarissaFirst spotted by Earth-based telescope observations in 1981, Neptune’s fourth-largest natural satellite was so tiny and dark that follow-up observations to confirm the discovery were unsuccessful…at least until Voyager 2 sights it on approach to the eighth planet, finding a tiny moon whose orbit corresponds to the theoretical orbit of the body originally sighted in 1981. In 1991, the International Astronomical Union will name this moon Larissa.

Comet Shoemaker-Levy 9

Shoemaker-Levy 9Astronomers on Earth discover a comet like none seen before: having flown close to Jupiter in July 1992, the comet has broken into multiple pieces in a configuration that its discoverers call “a string of pearls.” Calculations of the orbit of the newly detected comet, named Shoemaker-Levy 9 after the team that discovered it, reveal something stunning: the orbit of the fragments will bring them back to Jupiter in just over a year, at which point they are expected to collide with the planet rather than pass it by or go into orbit. Not only does this give Earth-based astronomers time to coordinate observations, but NASA has an ace in the hole: the entire event will be witnessed by the unmanned Galileo probe as it makes its final approach to the giant planet.


ErisAstronomers at Palomar Observatory discover a body beyond Neptune’s orbit that initial observations show is larger than Pluto. Eris is quickly dubbed the tenth planet by the media and the scientific community, and it is later found to have a small moon of its own in a close orbit, which is later named Dysnomia. But events overtake Eris and Dysnomia before the science textbooks have a chance to be rewritten to include a tenth planet: Eris becomes a case study in an ongoing debate within the International Astronomical Union about the definition of a planet. In 2006, the IAU will establish a set of parameters which determine that Eris isn’t a planet – and then rewrites the history books by deciding that Pluto isn’t either.

Mittens required on Pluto

PlutoScientists are already aware that Pluto is really cold, but recent observations suggest that it’s even colder than they had imagined. New radio telescope measurements of Pluto’s surface indicate that it’s a brisk -382 degrees Fahrenheit (scientists had earlier estimated a positively summery -364). Part of the reason for the slight chill in the air – if indeed there was any there – is that Pluto is on the outbound train. The tiny planet’s highly inclined orbit isn’t centered around the sun, while the solar system’s other worlds are more or less centered; part of Pluto’s orbit carries it further away from the sun and “under” the plane shared by the other planets. Curiously enough, however, the surface of Charon – Pluto’s nearly-identical-twin moon – is determined to be warmer than Pluto itself. The readings are taken by the Submillimeter Array in Hawaii by astronomers at the Harvard-Smithsonian Center for Astrophysics.

Mars in asteroid’s crosshairs

MarsAstronomers put the red planet on red alert after predicting 1-in-75 odds for an asteroid to collide with Mars on or near January 30th. The asteroid, discovered in November 2007, is on a trajectory that poses no threat to Earth but has better-than-usual odds of packing quite a wallop for Mars. The impact, if it does happen, could take place on the equator, near the Opportunity rover’s stomping (or, perhaps, roving) grounds, though NASA says it would pose no risk to Opportunity. A crater as large as Arizona’s Meteor Crater could be carved out of the Martian surface by any direct hit that does happen. Scientists prepare to watch the event with keen interest, as this event would be potentially cataclysmic if Earth was in danger, but provides a once-in-a-lifetime opportunity for observation on Mars.

SOFIA spots a black hole

The black holeNASA reveals that its Boeing-747-mounted SOFIA (Stratospheric Observatory for Infrared Astronomy) telescope, during a 2011 flight in which its sensitive infrared sensors were aimed at the center of the Milky Way galaxy, captured an image of the super-massive black hole at the heart of the galaxy. A disc of dust and gas circling the center of the galaxy – seven light years across – lights up the image. The black hole is believed to have a mass of over four million times that of Earth’s sun.

Pluto’s fourth and fifth moons named

P4 and P5Two tiny, recently-discovered satellites of dwarf planet Pluto have new named ratified by the International Astronomical Union; P4 is renamed Kerberos and P5 is renamed Styx. The names – related to the “underworld” theme that has governed the naming of Pluto and its moons to date – overlooks a popular online vote that suggested one of the moons should be named Vulcan, after Mr. Spock’s home planet in Star Trek. Kerberos, discoverd in 2011, is believed to be approximately 20 miles in diameter and orbits Pluto at a distance of roughly 37,000 miles. Styx, first sighted in 2012, is even smaller, with an estimated diameter of 15 miles, orbiting only 1,200 miles from Pluto, making it the innermost satellite (a distinction previously held by Pluto’s near-twin, Charon). NASA’s New Horizons spacecraft will have the opportunity to see the new moons up close when it does a flyby of Pluto in 2015.

Mega-eruption on Io

IoAstronomers using the Keck Observatory’s Hawaii-based telescopes and near-infrared cameras capture an image of a devastating volcanic eruption on Io, one of Jupiter’s largest moons (and known since 1979 to be very volcanically active). The eruption, unleashing enough molten material to reshape hundreds of square miles of Io’s surface, also reveals that the material erupted is hotter than any eruption in Earth’s recorded history. This is the most violent eruption seen to date in the solar system, and caps off two weeks of intense activity observed by the astronomers.

ASTRO-H / Hitomi

HitomiJAXA, the Japanese Space Agency, launches the ASTRO-H X-ray observatory satellite, nicknamed Hitomi, from Tanegashima Space Center. Carrying equipment provided by NASA and the Canadian Space Agency, Hitomi is intended to remain operational for three years, conducting X-ray astronomy from low Earth orbit. Though the launch proceeds without apparent problems, major technical issues will prevent Hitomi from fulfilling its mission objectives.

Hitomi breaks contact

HitomiJapan’s Hitomi satellite, launched in February on a three-year X-ray astronomy mission, suddenly breaks contact with JAXA ground controllers when they begin power-up and checkout procedures. Only brief telemetry signals are received from Hitomi before it falls silent. JAXA initiates emergency procedures to contact Hitomi and diagnose the problem, though some telescopic observations from Earth indicate that pieces of the spacecraft have fallen away from the spacecraft itself.

The moon of Makemake

Makemake and moonAstronomers reveal that Makemake, an icy dwarf planet orbiting in the distant Kuiper Belt region of the solar system, has a moon, first spotted in 2015 by a team using the Hubble Space Telescope. (The news comes just days after the 26th anniversary of Hubble’s launch.) With an estimated diameter of 100 miles (compared to the 870 mile diameter of its parent body), the satellite orbits Makemake at a distance of 13,000 miles, taking twelve days to complete one orbit. Previous observations failed to pick up on the dark, dim body due to the relatively bright glare of Makemake itself.

Hitomi lost

HitomiJAXA, the Japanese Space Agency, declares the Hitomi X-ray astronomy satellite a total loss, having lost all contact with it. Though the diagnosis of the evidence to date is ongoing, engineers conclude from the available data that Hitomi entered an uncontrolled spin and broke up in orbit. JAXA offers apologies not only to other countries’ space agencies who supplied equipment for Hitomi, as well as to astronomers who had hoped to use the satellite.