Galaxies are systems of stars, stellar remnants, interstellar gas, dust and dark matter that are held together by gravity. They can range in size from millions to trillions of stars.
Galaxies Portfolio
Planet a celestial body directly orbiting a star or stellar remnant. Star, Astronomical object consisting of a luminous spheroid of plasma held together by its own gravity
Stars
A nebula is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral or molecular hydrogen and also cosmic dust.
Nebulae