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Earth Science Astronomy Review
Terms in this set (40)
What statement best describes the age of our solar system and the universe?
The universe is at least twice as old as our solar system
The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion years ago?
Most scientists believe the Milky Way Galaxy is?
one of billions of galaxies in the universe
What sequence correctly lists the relative sizes from smallest to largest?
our solar system, Milky Way Galaxy, universe
Which celestial feature is largest in actual size?
the Milky Way
The Milky Way is best describes as?
Compared to earths solar system, the universe is inferred to be?
older and larger
The Milky Way galaxy is best described as?
a spiral-shaped formation composed of billions of stars
The suns position in space is best described as the approximate center of?
our solar system
A light year is?
the distance traveled by light in one year
The unit most used by astronomers to express the distances to other galaxies is?
What statement best describes galaxies?
they may contain billions of stars in a space much larger than our solar system
What does a red shift in light from distant celestial objects indicate to a scientist on Earth?
The universe appears to be expanding
Evidence that the universe is expanding is best provided by the?
red shift in light from distant galaxies
When viewed from earth, the light from very distant galaxies shows a red shift. This is evidence that these distant galaxies are?
moving away from earth
The Big Bang Theory, describing the creation of the universe, is most directly supported by the?
red shift of light from distant galaxies
The red shift of light from distant galaxies provides evidence that the universe is?
The more that the spectral lines of a star ate shifted to the red end of the spectrum?
The faster it is moving away from us
The velocity of a star toward or away from the Earth can be determined by measuring the?
shift of its spectral lines
The Doppler Effect predicts that light from a source moving away from earth will be?
Shifted to longer wavelengths
Based on the red-shift data on galaxies, most astronomers infer that the universe is currently?
The major evidence supporting the Big Bang Theory is?
observations that the Doppler red shift becomes greater as we look at more distant galaxies
Billion of Stars in the same region are called?
According to the Big Bang Theory, the universe began as an explosion and is still expanding. This theory is supported by observations that the stellar spectra of distant galaxies show a?
shift toward the red end of the spectrum
According to Hubbell's Law more rapidly moving galaxies are now?
further away from us
Which factor does not affect a stars absolute magnitude [luminosity]
the stars distance
Small cool stars would most likely appear to be?
The explosion of a massive star near the end of its life is known as a?
What are the two most abundant elements in a main sequence star?
hydrogen and helium
When a star less massive than our sun consumes all of its nuclear fuel it will then become a?
What type of star is Polaris?
An astronomer can estimate the temperature of a star by observing its?
What planet has the most eccentric orbit?
Compared to Jupiter and Saturn, Venus and Mars have greater?
Which planets diameter is approximately four times of Earths diameter?
The most abundant element of the sun is?
The Earth reaches its greatest orbital speed when it is?
closest to the sun
What are the jovian planets in order of increasing mass?
Uranus, Neptune, Saturn, Jupiter
Terrestrial planets move more rapidly in their orbits than jovian planets because terrestrial planets are?
closer to the sun
Red giant stars have greater lumonosity than our sun mainely because they are?
THIS SET IS OFTEN IN FOLDERS WITH...
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Evidence of the Earth's rotation
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