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Astronomy test study

task cards for test

question/termanswer/definition
Rotation the action of rotating around an axis or center.
Revolution 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
Light year 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).
Waxing (of the moon between new and full) have a progressively larger part of its visible surface illuminated, increasing its apparent size.
Waning (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 27.3 days
How long does it take for the moon to go from new moon to full moon? 29.5 days
Terrestrial planets Planets made of rock
Gas planets Planets made of gas
Inner planets Mercury, Venus, Earth, and Mars
Outer planets Neptune, Uranus, Saturn, and Jupiter
Asteroids 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.
Asteroid belt 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.
corona an aura of plasma that surrounds the Sun
Solar wind the continuous flow of charged particles from the sun which permeates the solar system.
Sunspot 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. main sequence
Nebula 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.
Main sequence the stage where a star spends most of its existence
Red giant 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.
Red supergiant a red giant but huge.
Supernova a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
Black dwarf a theoretical stellar remnant
Black hole 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? their mass
A protostar must start what process to be considered a star? nuclear fusion
Milky Way the galaxy that includes our Solar System
Elliptical 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.
Spiral 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.
Irregular Irregular
What is at the center of a galaxy? supermassive black hole
Created by: willdowdy9956
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