How can planet retrograde motion be explained by Earth center hypothesis? By the Sun-center hypothesis?
Why the observation of a full set of phases for Venus backs the Copernican system?
Explain in your own words why the observation of a full set of phases for Venus backs the Copernican system.
Explain the method by which most planets have been discovered around other stars
In 2 paragraph please explain the method by which most planets have been discovered around other stars.
Explain why Cephid variable stars are so useful for determining the distances of galaxies.
Outline the argument used to infer that the physical size of quasars is very small
Outline the argument used to infer that the physical size of quasars is very small
(See attached file for full problem description with proper symbols) --- Q2a The specific angular momentum (with respect to a planetary body) of a test mass that orbits a planet at a distance r with angular speed is j = r2 (scalars). Show how this follows from the expression of the angular momentum of this test mass, J ...continues
Crescent moon in the western horizon
I'm having a hard time figuring out what time it is when a crescent moon appears in the western horizon. Does it change throughout the year. I thought it was around 3 and 5 pm, but then I see that it is just after the sunset. The sun sets at different times throughout the year. so my question is What time is it when a crescen ...continues
Why is it more difficult to notice the westward motions of the stars that are high in the sky than those that are near the horizon?
Why do you think it was so difficult for people to accept the heliocentric model in the 1600s? And what do you think was the impact of this model, once it was accepted?
Determine if the following statement is true or false. If false, explain why and give an example that shows it is false. See attached file for full problem description.
