The cosmological redshift is not really a velocity at all, but a measure of the expansion of space-time
Indicate whether the statement is true or false
TRUE
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What type of galaxy has only old stars, little dust, low density, hot gas, and no star formation?
A. irregular galaxies B. elliptical galaxies C. spiral galaxies D. All types of galaxies share these features
The luminosity of the Sun is a measure of
A) the energy received by the Sun on Earth's surface. B) the energy received by the Sun at the location of Earth. C) the energy received by the Sun at any location in the solar system. D) the energy emitted by the Sun at the photosphere. E) the total energy emitted by the Sun in all directions.
The brightest 100 stars viewed from Earth are mostly not on the main sequence (even though most stars are) because:
A. only high mass stars formed near us in the Galaxy. B. our region of the Galaxy is very young. C. the most luminous stars are giants and supergiants that have already finished their main sequence lifetimes. D. the main sequence is the shortest part of a star's life, so stars don't spend much time there. E. our region of the Galaxy is very old.
Why do firemen use infrared cameras to look into smoke filled buildings?
A) The smoke itself gives off a lot of infrared light. B) They can avoid all the broken glass because glass is bright in infrared light. C) They can see through the smoke to look for people inside the room. D) They can see if there is anything radioactive in the room. E) They can tell if the smoke is toxic.