Mercury is tiny, barely bigger than the Moon. Its metallic core makes up 70% of the planet’s mass, vastly exceeding Earth’s 32% and Mars ’ 25%. It’s unlikely that the core actually formed like this.

(NewsNation) — In just a matter of days, the interstellar comet known as 3I/ATLAS is expected to pass closest to the sun between the orbits of Mars and Earth. New data from the International Gemini ...

We could be overlooking an entire population of asteroids that pose a threat to Earth on the very simple basis that they're extremely hard to see. In the space shared by the orbit of Venus, hundreds ...

Harvard astornomer Avi Loeb suggests interstellar object 3I/ATLAS could've sent off the Wow! Signal back in 1977.