We know how fast a distant galaxy is moving away from us on the basis of its

A) mass.
B) color.
C) spectrum.
D) age.
E) luminosity.


C) spectrum.

Physics & Space Science

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In the 1800s, many people assumed that Venus would have tropical temperatures, but instead it is very hot. Explain why tropical temperatures would have made sense given what was known in the 1800s, and why Venus instead turns out to be very hot

What will be an ideal response?

Physics & Space Science

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a maximum?

A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points

Physics & Space Science

An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?

a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00

Physics & Space Science

Greenland and Antarctica are covered with glacial ice sheets called ______________ glaciers

Fill in the blank(s) with correct word

Physics & Space Science