Space

4 theories about how the moon formed

Astronomers may have found a new way to detect alien planets

Deep-space photo reveals thousands of supermassive black holes

2 stars could collide and light up the night sky in 2022

Quadrantids soar in time-lapse video

The best skywatching moments in January

This is what the first houses on Mars will probably look like

What to see in the sky in 2017

2 merging galaxies discovered that act like a huge, cosmic laser

This star is planning a visit to our solar system

Huge ball of gas that could be 'cradle of life' probably smells gross

World's largest digital sky survey includes 3 billion objects

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