The cosmic microwave background is:
A) redshifted in the direction of Earth's motion.
B) redshifted in the direction of the Sun's motion.
C) redshifted in the direction of the center of the Milky Way.
D) blueshifted in the direction of Earth's motion.
E) blueshifted in the direction of the Virgo Cluster.
Question 2
If the Sun were replaced by a one solar mass black hole:
A) all terrestrial planets would fall in immediately.
B) we would still orbit it in a period of one year.
C) we would immediately escape into deep space, driven out by its radiation.
D) our clocks would all stop.
E) life here would be unchanged.
Boundaries within landscapes created by human activity (background) and natural environmental gradie
From space earth shows itself as a planet covered mostly by water.
Motion of the barycenter of the Solar System relative to the Sun
Proper Motion of Barnard’s Star
A goniometer is used to measure range of motion of the patient’s arm.
Earth’s Revolution and Rotation: The Causes of Earth’s Seasons