Comets
Small bodies composed of ice and rock in various orbits about the sun.
Small bodies composed of ice and rock in various orbits about the sun.
A telescope with a mirror in the back and a lens in the front. The most popular designs are the ...
A configuration in which two celestial bodies have their least apparent separation.
A distinctive pattern of stars used informally to organize a part of the sky. There are 88 official constellations, which ...
The outer part of the Sun's atmosphere. The corona is visible from Earth during a total solar eclipse. It is ...
Atomic nuclei (mostly protons) that are observed to strike the Earth's atmosphere with extremely high amounts of energy.
A tube-like configuration of energy that is believed to have existed in the early universe. A cosmic string would have ...
The study of celestial systems, including the Solar System, stars, galaxies, and galactic clusters.
A branch of science that deals with studying the origin, structure, and nature of the universe.