Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...

"The new model can account for both structure formation and stability, and the key observational properties of the expansion of the universe at large." ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s matter. The rest is mysterious dark matter. But even that modest slice didn ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

The Andromeda galaxy is surrounded by a constellation of dwarf galaxies that are arranged in a highly lopsided manner. Analysis of cosmological simulations published in Nature Astronomy reveal that ...

Can scientists build a detector of near-Earth objects that would sense gravitational waves produced by any "dark" objects ...

In recent years, one of the most troubling puzzles in astrophysics has grown more urgent. Scientists have realized that the ...

"Milky seas” are one of the rarest reported forms of bioluminescence. A new scientific database may finally reveal the ...