Author Question: How and why would the noon Sun appear different to an observer on Mercury compared to one on Earth? ... (Read 34 times)

dakota nelson · **on:** Jul 27, 2018

How and why would the noon Sun appear different to an observer on Mercury compared to one on Earth?

What will be an ideal response?

Question 2

The redshift of the galaxies is correctly interpreted as

A) the differences in temperatures and star formation in old and young galaxies.
B) a Doppler shift due to the random motions of galaxies in space.
C) an aging of light as gravity weakens with time.
D) space itself is expanding with time, so the photons are stretched while they travel through space.
E) placing our Galaxy near the center of the Local Group.

Anna · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

Mercury's rotation axis is almost perpendicular to its orbit. This means the angle of the Sun with the southern (or northern) horizon never changes. On Mercury, an observer at the equator would always see the noon Sun overhead, an observer at the pole would always see it on the horizon. On Earth, the altitude of the Sun changes over the year because of the 23.5 degree axial tilt.

Answer to Question 2

D