We worked out how many trips each of the solar system's eight planets has taken around the sun over the past 4.6 billion years.
Earth will become too hot to handle in a billion years. There's a (very) remote chance a passing star could save us by knocking our planet back into the habitable zone.
New calculations suggest the sun is a few fractions of a percent smaller than previously estimated, and that could change how we study it.
A white dwarf spotted by the Gaia telescope was predicted to smash into our solar system in 29,000 years. But we'll be safe after all.
The massive volcanic comet 12P/Pons-Brooks, which grows giant horns when it erupts, has exploded for a third time in five months as it continues to race toward the sun.
See Mars' geology up close, thanks to decades of stunning images from the Mars Express satellite, in a new visualization of Noctis Labyrinthus, the 'Labyrinth of Night'.
Astronomers may have detected a dozen large objects lurking beyond the Kuiper Belt at the edge of our solar system, suggesting there could be another equally massive, "second Kuiper Belt" hiding beyond the orbit of Pluto.
Comet Nishimura, which was only discovered in August, has survived its closest approach to the sun and will brighten over the next week. But is it still visible from Earth?
"We aren’t going to see little green men but rather spectral signatures of these key chemicals, or what we call biosignatures."
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