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2018 Solar System and Space Vocab

Across
the small, dense core of a giant star that remains after the star has lost its exterior matter
The amount of light energy emitted per second
solid, interplanetary particles passing through Earth’s atmosphere
The different appearances of the Moon as it orbits Earth
a large cloud of gas and dust in space
a total or partial obscuring of one celestial body by another
Massive systems of stars, dust, and gas held together by gravity
The time it takes a planet to move completely around the Sun
the average distance from Earth to the Sun, equals 149,600,000 km
a region of space from which no matter or radiation can escape
the remaining portion of a meteoroid that reaches Earth’s surface
an imagi- nary line through the center of the planet
The planets beyond the inner planets—Jupiter, Saturn, Nep- tune, and Uranus
When a supergiant star explodes before dying
two atomic nuclei combine to form a larger nucleus with a higher mass
Down
a star composed mainly of neutrons, they are what remain of stars after supernova explosions
The time it takes for one rotation
Theory that expansion of the universe began about 14 billion years ago
An object that revolves around a planet
The four planets closest to the Sun—Mercury, Venus, Earth, and Mars
he observed luminosity of a celestial body, such as a star, as observed from Earth
An oval
the distance light travels in one year
Sun-sized (about one to eight solar masses) stars use up their fuel become ____ ________.
a small, icy body in a highly elliptical orbit around the Sun