Astronomers often record solar images in the ____ part of the electromagnetic spectrum because the gaseous layers high in the Sun's atmosphere are very hot and emit most of their light at short wavelengths.
a. microwave
b. gamma
c. visible light
d. ultraviolet
e. infrared
Question 2The Hubble time is____.
a. an estimate of the age of the Universe
b. the time needed for a galaxy to travel 1 Mpc
c. not connected to Hubble law of galactic redshifts
d. the time for light to cross the Universe
e. the time needed for galaxies to form
Question 3Of the following parts of the Sun, which is the hottest?
a. chromosphere
b. supergranules
c. photosphere
d. corona
e. sunspots
Question 4The proper interpretation of the Hubble law (which relates the redshift of a galaxy to its distance) is that as time goes on, galaxies are____.
a. staying relatively still in space while the space between the galaxies contracts
b. moving away from a common center in space that is neither expanding nor contracting
c. staying relatively still in space while the space between the galaxies expands
d. moving away from a common center while the space between the galaxies expands
e. moving toward a common center in space that is neither expanding nor contracting
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