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Semester II Exam
Terms
Question | Answer |
---|---|
Cloud of dust and gas where stars are born. | Nebula |
The distance light travels in one year. | Light-year |
The distance between the Earth and the sun. | Astronomical Unit |
Spinning on an axis. | Rotation |
The elliptical path of one body as it orbits another body in space. | Revolution |
The time it takes Earth to revolve around the sun one time. | Year |
The time it takes the moon to revolve around the Earth once. | Month |
The time it takes Earth to rotate once on its axis. | Day |
The natural rise and fall of water caused by the gravitational pull of the moon and Earth. | Tides |
An artificial or man-made body that revolves around another body. | Satellite |
The different appearances of the moon based on its position around the Earth. | Phases |
The sunlit fraction of the moon is getting larger. | Waxing |
The sunlit fraction of the moon is getting smaller. | Waning |
When the sun, Earth, and moon are aligned and the shadow of the Earth falls on the moon. | Lunar Eclipse |
When the sun, moon, and Earth are aligned and the shadow of the moon falls on the Earth. | Solar Eclipse |
The shape of the orbit of a comet. | Highly Elliptical |
Dust,gas, and ice also called a "dirty snowball". | Comet |
Small rocky bodies in orbit around the sun. | Asteroids |
Rocky bodies that are smaller than asteroids orbiting the sun. | Meteoroids |
Bright streak of light caused by a meteoroid burning up in the atmosphere. | Meteor |
A meteoroid that strikes Earth's surface. | Meteorite |
A galaxy with a bulge at the center and blue arms. The Milky Way is this type. | Spiral |
A galaxy with a bright center, oval in shape and very little dust and gas. | Elliptical |
A galaxy that has no specific shape. | Irregular |
The youngest stars on the main sequence. | Massive Blue Stars |
The actual brightness of a star. | Absolute Magnitude |
How bright a star looks. | Apparent Magnitude |