Is Hubble's tuning fork diagram a real evolutionary tool? Why?
What will be an ideal response?
No, galaxies are not progressing from round ellipticals to flatter spirals over time. Observational evidence seems to indicate that collisions and tidal interactions between galaxies are commonplace and may be the main physical process driving galaxy evolution.
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The main sequence has a limit at the lower end because
a. low mass stars form from the interstellar medium very rarely. b. low mass objects are composed primarily of solids, not gases. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum temperature for hydrogen nuclear fusion (the definition of a star).
Luminosity class IV objects are known as ____________________
Fill in the blank(s) with correct word
When a hot object makes thermal contact with a cold object, the direction of
A) temperature is from hot to cold. B) internal energy flow is from hot to cold C) both of these D) neither of these
Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes. (a) What is the frequency (in hertz) of Tarzan's swing? (b) How long is the vine he is using?
What will be an ideal response?