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Astronomy test study
task cards for test
|the action of rotating around an axis or center.
|the movement of an object in a circular or elliptical course around another or about an axis or center.
|Most common elements in the universe
|Helium and hydrogen
|a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
|(of the moon between new and full) have a progressively larger part of its visible surface illuminated, increasing its apparent size.
|(of the moon) have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.
|Which side is the moon lit up on during the waxing phases?
|A waxing moon will be illuminated on the right side
|Which side is it lit up on during the waning phases?
|a waning moon will be illuminated on the left side.
|Be able to identify moon phases on a diagram
|New moon. Waxing Crescent. First quarter. Waxing Gibbous. Full moon. Waning Gibbous. Last (third) quarter moon. Waning Crescent.
|Moon’s revolution period
|How long does it take for the moon to go from new moon to full moon?
|Planets made of rock
|Planets made of gas
|Mercury, Venus, Earth, and Mars
|Neptune, Uranus, Saturn, and Jupiter
|a small rocky body orbiting the sun. Though some have more eccentric orbits, and a few pass close to the earth or enter the atmosphere as meteors.
|a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars
|meteors, meteoroids, and meteorites.
|rocks from space that interact with earth
|3 parts of a comet
|the tail, the nucleus and the coma.
|Which direction does the tail of a comet point?
|away from the sun
|What causes the tail of a comet?
|the sun's radiation pressure.
|an aura of plasma that surrounds the Sun
|the continuous flow of charged particles from the sun which permeates the solar system.
|a spot or patch appearing from time to time on the sun's surface, appearing dark by contrast with its surroundings.
|Source of Sun’s energy
|nuclear fusion within the sun
|Absolute magnitude vs. Apparent magnitude
|apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years
|90% of the stars on an H-R diagram are ______________ ______________ stars.
|a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
|the stage where a star spends most of its existence
|a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
|a red giant but huge.
|a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
|a theoretical stellar remnant
|a region of space having a gravitational field so intense that no matter or radiation can escape.
|What causes stars to have different life cycles?
|A protostar must start what process to be considered a star?
|the galaxy that includes our Solar System
|a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant, or resulting when a cone is cut by an oblique plane which does not intersect the base.
|winding in a continuous and gradually widening (or tightening) curve, either around a central point on a flat plane or about an axis so as to form a cone.
|What is at the center of a galaxy?
|supermassive black hole