The location of a star in the HR diagram indicates its temperature and intrinsic brightness
Indicate whether the statement is true or false
T
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What did Carl Sagan mean when he said that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that the Earth formed at the same time as the Sun C) that the carbon, oxygen, and other elements essential to life were created by fusion in stellar cores D) that the Sun formed from the interstellar medium: the "stuff" between the stars E) that the universe contains billions of stars
When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?
a. 5 c. 4 b. 3 d. The correct value is not given.
How are Cepheids and RR Lyrae stars different?
What will be an ideal response?
The ________-year solar cycle is characterized by a variation in the number of sunspots through a reversal of the magnetic polarity of the Sun as a whole
A) 2 B) 10 C) 11 D) 22 E) 44