An age-old astronomy technique reveals new clues about the vast number and type of stars in the universe.
Stars are giant, luminous spheres of plasma. Galaxies consist of stars, stellar remnants, dust, gas, and dark matter, bound together by gravity. Learn more about stars and galaxies.
Vast orbiting clouds of planetary wreckage could cause a distant young star's strange dimming behavior, a new study shows.
Heavyweight stars up to hundreds of times the mass of the sun may be more abundant than previously thought, a new study finds.
Astronomers spotted giant bubbles on the surface of a huge red-giant star, showing for the first time the convective cells that move heat around in these enormous objects.
Orion isn't the only constellation to look for this season. Here's a guide to some nice other sights in the winter sky.
Featuring the bright, red supergiant star Antares, the Rho Ophiuchi cloud complex is one of the most vibrant and colorful nebulas in space and the closest star-forming region to the solar system.
The shimmering arc of the Milky Way stretches high in the sky in this view of Zabriskie Point in California's Death Valley National Park.
A stunning new view of the Andromeda galaxy reveals an unexpected pair of supermassive black holes that researchers say are in close orbit around each other.
Two enormous galaxies seen merging in the distant universe have astronomers rethinking the leading theory of how galaxies form.
The European Space Agency (ESA) released a video explaining how astronomers used the Gaia telescope to discover a large star cluster earlier this year.
Imagine what the iconic pillars of the Eagle Nebula would look like if a powerful force caused the stellar nursery to create stars at a thousand times its current rate.
Astronomers have captured a stunning new view of the surface of an aging red giant star, revealing new clues about what the future may hold for our own sun.
A faint spiral galaxy lurks in deep space in this stunning view of the Pleiades, an open star cluster in the constellation Taurus.
Astronomers have spotted a dusty ring around the nearby star Proxima Centauri, hinting at the existence of other planets in addition to the famous Proxima b, a new study reports.
Distant planets tell all: A new analysis uses alien worlds' orbital treks to peek inside their stars.
Lab experiments simulating the formation of new stars may have revealed why young stars give off much less X-ray radiation than expected, a new study finds.
The beautiful Heart Nebula, also known as IC 1805, is a bright, red emission nebula with a shape that resembles a human heart.