In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

Unpredictable bursts of light are pulsing from the debris surrounding Sagittarius A*, offering new insights into the ...

The supermassive black hole in the heart of the Milky Way Galaxy, Sagittarius A*, constantly emits flares like fireworks.

The center of our Milky Way galaxy is hidden from the prying eyes of optical telescopes by clouds of obscuring dust and gas.

Since Hubble’s launch, astronomers have discovered over 1 trillion galaxies, but Andromeda stands out as the closest and most ...

Spanning approximately 1.3 billion light-years—over 13,000 times the length of the Milky Way—it may be the longest known structure in the universe ... While these structures are temporary, as the ...

Isolated, low-mass galaxies help researchers study the impact of reionization on their star formation histories (SFHs) ...

Artist's concept of light flares along Sag A*'s accretion disk. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI)) ...

In the Milky Way's central bulge, about 24,000 light-years from Earth, a peculiar pair of objects appears to be hurtling ...

From road-tripping adventurers to luxury resort goers, more travelers are seeking the stars than ever before. Saudi Arabia is ...

25.5 x 34 cm. (10 x 13.4 in.) ...