Is the cosmological redshift really a velocity of a given galaxy?
What will be an ideal response?
No, it is a measure of how fast the entire universe is expanding in spacetime, with the galaxy just taken along for the ride.
You might also like to view...
Both Jupiter and Saturn
a. have liquid metallic hydrogen in their interiors. b. have rings. c. emit more energy than they absorb from the Sun. d. have belt and zone circulation. e. All of the other choices are correct.
Kepler based his theories on the precise planetary observations of Tycho Brahe
Indicate whether the statement is true or false
What is white light? Why do we perceive different colors with a prism?
What will be an ideal response?
A hill is 200 m long and makes an angle of 12° with the horizontal. As a 50-kg jogger runs up the hill, how much work does gravity do on the jogger?
a. 98,000 J c. 20,000 J b. -20,000 J d. zero