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theory that states that the Moon was formed when a large, mars-sized object struck Earth about 4.6 billion years ago
the moon moves 13 degrees in its orbit every day, causing the moonrise to be
50 minutes later each day
new moon -> waxing crescent -> first quarter -> waxing gibbous -> full moon -> waning gibbous -> last quarter -> waning crescent -> new moon
2 pieces of info to calculate eccentricity of an ellipse
1. distance between 2 foci of the ellipse
2. length of the ellipses major axis(longest part of the ellipse)
model of the solar system with earth at the center and the planets and stars orbitiing it
model of the solar system with the sun at the center with the planets and moons orbiting it
danish nobleman who made the 1st long-term observation of the night sky (about 20 years' worth)
Keplers 1 law of planetary motion
planets travel in elliptical orbits around the sun with the sun at 1 focus (a circle has 1 focus whereas an eclipse has 2 foci)
equal area law
each planet moves around the Sun in such a way that an imaginary line joining the planet to the sun will sweep over equal areas of space in equal areas of time
redshift is caused by
light being "stretched" as the distance between the source and the viewer on Earth is increasing
blueshift is caused by
the compression of light waves as the source and the viewer on Earth are getting closer to one another
how bright a star would appear to be to an observer if all of the stars were 10 parsecs away from earth
2 stars of unequal brightness that revolve around and pass in front of each other at regular intervals
the initial size (mass) of the nebula determines wether the star will be a
dwarf, main sequence, massive, or supermassive star
fusing the remaining iron in its core into heavier elements and scattering them across the universe as it looses its outer layer
black holes are formed when
a supermassive star collapses from the force of gravity after it overcomes the resistance of the weight of the neutrons
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