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40 Cards in this Set

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what is astronomy?
the study of matter and energy in the universe, especially where they are concentrated.
What sciences is astronomy a blend of?
physics, geology, meteorology, chemistry, biology, MATH
10^1
10
10^2
100
10^3
1000
10^0
1
10^-1
0.1
10^-2
0.01
What is the solar system composed of?
star(s), planets, minor bodies held by gravity
What is in OUR solar system?
Sun, 8 planets, moons, comets, asteroids
What is a galaxy?
a collection of stars, gas, dust held by gravity
stars are in the Milky Way galaxy?
~400 billion stars
What is the universe composed of?
~100 billion galaxies distributed in clusters held by gravity
What is the lagoon nebula?
a star-forming region in space, about 5000 LYs away
What is a nebula?
cloud of gas and dust
What is a lightyear
the distance light travels in a year
What is the formula for distance?
D= velocity*time
What is the marer of a good theory?
It has repeatable results
How far are the Earth and Moon apart?
400,000 km
How far are the Earth and the Sun apart?
150 million km
What does the celestial sphere depict?
It depicts the sky from a specific location @ Earth. Earth at the center and the stars are equidistant, with the Sun and stars moving around Earth
What are circumpolar stars?
the stars that move around the celestial pole
What is an ecliptic?
path the sun makes as it moves through the stars
What does rotation mean?
the spinning motion (ex. of the Eart) about an axis.
How often is the rotation of the earth?
1x/24 hrs
What is a revolution?
the orbital motion of one body around another
How often does the Earth revolve around the Sun?
1x/ 365.25 days
When are various stars visible?
At various times of the year
How does the SUn appear to move over the year?
It seems to move w/ respect to the stars through the constellations of the zodiac
What does the Sun's annual apparent motion trace out?
the ecliptic
What does the celestial sphere depict?
It depicts the sky from a specific location @ Earth. Earth at the center and the stars are equidistant, with the Sun and stars moving around Earth
What are circumpolar stars?
the stars that move around the celestial pole
What is an ecliptic?
path the sun makes as it moves through the stars
What does rotation mean?
the spinning motion (ex. of the Eart) about an axis.
How often is the rotation of the earth?
1x/24 hrs
What is a revolution?
the orbital motion of one body around another
How often does the Earth revolve around the Sun?
1x/ 365.25 days
When are various stars visible?
At various times of the year
How does the SUn appear to move over the year?
It seems to move w/ respect to the stars through the constellations of the zodiac
What does the Sun's annual apparent motion trace out?
the ecliptic