At the core of the galaxy, about 26,000 light-years away in space, is Sagittarius A*, a supermassive black hole about 4 ...

NASA Odyssey orbiter snapped a first-ever image of a Mars volcano peeking above clouds before dawn. It’s twice as tall as Earth’s largest volcano.

Mars orbiter captures first-ever photo of volcano above clouds, taller than any on Earth Known as Arsia Mons, the volcano on Mars dwarfs Earth’s tallest volcano, Mauna Loa in Hawaii.