The discovery probability of long-period comets passing near the Sun is highest during their first passage and then declines, or fades, during subsequent...
Using data from NASA’s Transiting Exoplanet Survey Satellite (TESS) and several ground-based facilities, astronomers have discovered a long-period sub-Neptune...
A team of professional astronomers and citizen scientists from the Backyard Worlds: Planet 9 project has discovered a planetary-mass object co-moving with...
Astronomers using NASA’s Transiting Exoplanet Survey Satellite (TESS) have identified a dense, ultra-short-period sub-Earth planet transiting the bright,...
The super-Earth HD 3167b is close to orbiting within the stellar equatorial plane, while the mini-Neptune HD 3167c orbits above the poles of the host star,...
The TOI-178 planetary system, a 7.1-billion-year-old system of six planets in the super-Earth to mini-Neptune range, five of which are locked in a rare...
Astronomers are still searching for a hypothetical Planet Nine in the distant reaches of the Solar System, but an 11-Jupiter-mass planet called HD 106906b...
Early in the formation of Jupiter as a planet, it moved closer to and then away from the Sun due to interactions with the planetary disk of the young Solar...
Our Solar System contains a large population of icy bodies stretching well beyond the orbit of Neptune. These objects are remnants from the early formation...
Saturn is orbited by 82 moons, and tidal friction within the giant planet causes the moons to migrate outwards. In a study published this week in the journal...
Mars had a massive ring system several billion years ago, according to new research from the SETI Institute and Purdue University.
An artist’s impression...
At least 17 high-inclination Centaurs and two trans-Neptunian objects were captured by the Solar System from the interstellar medium, according to a new...
At the center of the Milky Way lurks Sagittarius A*, a supermassive black hole that is four million times the mass of the Sun. Located 26,000 light-years...
Using data from the Atacama Large Millimeter/submillimeter Array (ALMA), a team of astronomers has found striking orbital geometries in circumbinary protoplanetary...
WASP-12b will be completely consumed by its host star in 3.25 million years, according to a new study led by Princeton University astrophysicists.
An artist’s...
A new study, published in the journal Icarus, shows that Naiad and Thalassa, two innermost moons of Neptune, are locked in an unusual type of orbital resonance.
The...
For several years, scientists have tried to explain why so many pairs of exoplanets have an odd configuration — their orbits seem to have been pushed...
A team of planetary researchers at the University of Colorado at Boulder has offered up a new theory for the existence of strange trans-Neptunian objects...
