Psu Astro 7n Midterm Study Guide Graded A+

Besides, the discovery that moons orbit Jupiter, what other discovery made by Galileo Galilei, with an early telescope, proved that the Earth is not at the center of the Universe? {Ans: The phases of Venus}If Earth's moon was full on May 1, 2007. When was it next in the First quarter phase after this full moon? {Ans: May 22nd}Star A is 4000 K, and Star B is 8000 K. True or false: The color of Star A is redder than Star B. {Ans: True}What happens to the Earth in one year? {Ans: It orbits the Sun, once (also referred to as one complete revolution about the Sun)}The Earth radius is about 6400 km. If you were in orbit in the space station 150km above the ground, the force of gravity you feel from Earth would be {Ans: slightly weaker than when you are standing on Earth}What was Kepler's first law? {Ans: Planets revolve around the sun in elliptical orbits with the sun at one focus of the ellipse}