Earth's nearest neighbor in space, about 238,000 miles from the earth; more generally a natural satellite of any planet
Orbit of a satellite that is maintaining its position over the same spot on the earth
Hypothetical space-time tunnel linking widely spread black holes with another universe
Imaginary line passing through the center of planets, moon, and stars
Measure of about 6 trillion miles, used to measure distances between objects in outer space to or between stars
Mass of cosmic dust and ice orbiting the sun, often called a 'dirty snowball'
The universe, especially as an orderly, harmonious system
Small apparent displacement of a heavenly body caused by the motion of the earth in its orbit
Triple star, brightest in the constellation Centaurus, and second closest to earth
Apparent change in the frequency of sound, light, or radio waves caused by a change in the distance between the source of the wave and the receiver
Group of stars in Ursa Major containing seven bright stars, two of which point toward the North Star
Most distant objects yet detected in the universe, whose name is derived from 'quasi-stellar'
Point farthest from the sun in the orbit of a comet and other orbiting bodies
Large brilliant meteor that usually leaves a glowing tail
Point farthest from the earth in the orbit of any Earth satellite
Existing or occurring between or among galaxies
Nearly straight-line configuration of 3 celestial bodies in a gravitational system
Star that brightens suddenly and then fades
Star that is frequently the source of powerful X-rays and is made up almost entirely of a very dense mass of electrically neutral subatomic particals
Part of the Earth's or moon's shadow from which part of the solar disk is visible during an eclipse
Major fireball or brilliant meteor, especially one that explodes
Lowest possible energy state
Rapidly spinning neutron star that emits short, intense pulses of radiation, especially radio waves, with a high degree of regularity
Sky's brightest body and the one around which the Earth and other planets revolve, composed of about 75% hydrogen and 25% helium; It is about 93 million miles from the Earth
Instrument, named for its shape as approximately 1/6th of a circle, that replaced the astrolabe and was used by navigators to find the altitude of the sun or a star until after WWII
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