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Space - 2017

Across
An oval
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
The different appearances of the Moon as it orbits Earth
Theory that expansion of the universe began about 14 billion years ago
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
solid, interplanetary particles passing through Earth’s atmosphere
an imagi- nary line through the center of the planet
When a supergiant star explodes before dying
the small, dense core of a giant star that remains after the star has lost its exterior matter
the distance light travels in one year
Down
The amount of light energy emitted per second
the remaining portion of a meteoroid that reaches Earth’s surface
The four planets closest to the Sun—Mercury, Venus, Earth, and Mars
two atomic nuclei combine to form a larger nucleus with a higher mass
The time it takes for one rotation
The planets beyond the inner planets—Jupiter, Saturn, Nep- tune, and Uranus
he observed luminosity of a celestial body, such as a star, as observed from Earth
a star composed mainly of neutrons, they are what remain of stars after supernova explosions
a region of space from which no matter or radiation can escape
An object that revolves around a planet
a large cloud of gas and dust in space