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.
Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen
The span of Homo sapiens sapiens’ time on earth
Landmarks in the evolution of life on Earth
Hints of Earth’s Early Appearance
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
Earth’s orientation