Disk galaxies, like our own Milky Way galaxy, commonly consist of both a thick and thin disk of stars—each with different features, including stellar population and movement. Three major theoretical ...

Astronomers using the James Webb Space Telescope have spotted something that shouldn’t exist—at least not so early in the ...

Galaxies like the Milky Way grow by merging with smaller galaxies over billions of years, unlike dwarf galaxies, which have long been thought to lack the heft to attract mass and grow in the same way.

Astronomers have used high-resolution simulations to study ultra-faint dwarf galaxies orbiting the Milky Way, finding that their present-day properties are highly sensitive to conditions in the early ...