On April 26, 1920, Harlow Shapley of Mount Wilson Observatory and Heber Curtis of Lick Observatory held a public debate at ...

Throughout the many adventures of Star Trek, it's extremely rare that the Enterprise (or any other ship) leaves the Milky Way ...

The Sombrero galaxy and its glowing halo of stars have never looked this good. The latest photo of the popular hat-shaped ...

Ultra-faint dwarf galaxies orbiting the Milky Way are cosmic fossils. New simulations reveal how these tiny systems reflect ...

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A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated ...

Ultra-faint dwarf galaxies – tiny satellite galaxies orbiting the Milky Way – have long been seen as cosmic fossils. Now, a new study published today in Monthly Notices of the Royal Astronomical ...

Elisha Sauers writes about space for Mashable, taking deep dives into NASA's moon and Mars missions, chatting up astronauts ...

Imagine shrinking Earth to the size of a small ball to reveal just how vast the Universe is. If it were 12 centimeters wide, ...

Large galaxies sometime have small hangers-on that are incredibly difficult to spot, but "wonderful discoveries are made ...

Small and faint satellites of the Milky Way's neighbor The so-called ultra-faint dwarf galaxies (UFDs) are the least luminous, most dark matter-dominated, and least chemically evolved galaxies known.

Look up on a clear night. A soft, luminous band arcs from horizon to horizon. That glowing smear of light is our own galaxy, the Milky Way, seen from the inside. Every visible star belongs to one of ...