Astronomy

Luminous spheres of plasma powered by nuclear fusion.

The 88 official sky regions and their patterns of stars.

Gravitationally bound systems of stars, gas, dust, and dark matter.

Interstellar clouds of gas and dust — stellar nurseries and remnants.

Worlds orbiting the Sun, from rocky terrestrials to gas and ice giants.

Rounded worlds that share their orbital zone with other bodies.

Natural satellites orbiting planets and smaller bodies.

Planets orbiting stars beyond the Sun.

Rocky and metallic remnants from the early Solar System.

Icy bodies that grow tails as they near the Sun.

Space rocks that survive the fall to a planet's surface.

Regions where gravity is so strong not even light escapes.

Brilliant active galactic nuclei in the distant universe.

Rapidly spinning neutron stars that beam radiation.

The explosive deaths of stars.

Groups of stars born from the same cloud.

Robotic and crewed journeys that explore the Solar System and beyond.

The vehicles and probes built to travel and work in space.

Observatories in orbit, above the blur of the atmosphere.

Ground-based sites built to study the sky.

The scientists who study the universe — a working directory.