Can you travel to outer space and never stop? Science can tell us a lot. But some things we don’t know yet, like whether space just goes on forever.

Pure hydrogen and helium gas flows into a galaxy. It's used to make new stars. Those stars make new elements, which are later released back to intergalactic space.

Hycean planets are huge, hot worlds covered by oceans, with thick hydrogen atmospheres. They might be key to discovering life beyond Earth.

NASA’s Near-Earth Asteroid Scout (NEA Scout), a cubesat launching on Artemis 1, will navigate space and visit a near-Earth asteroid by sailing on sunlight.

Astronomers have discovered two asteroids in the asteroid belt between Mars and Jupiter that are much redder than the others. The researchers say they likely migrated inward from the outer reaches of the solar system.

Planet Nine, according to scientists, has an orbit that lies more than 300 AU from the sun and is tilted about 16 degrees from the ecliptic.

Interstellar objects may dominated the Oort Cloud, according to two scientists from Harvard. Their calculations are based on the interstellar comet Borisov.

Scientists have found evidence that fragments of Ceres' icy crust are sitting on the surface of the dwarf planet. They were exposed by impacts from asteroids or other rocky debris. For scientists, the finding provides new clues about the interior and evolution of this enigmatic world.

Comet ATLAS was seen to break apart in 2020, while still relatively far from the sun. An astronomer thinks our early ancestors saw this comet.

Huge rings of dust were discovered by astronomers around the black hole V404 Cygni in 2015. The rings are only visible in X-ray images.