On the H-R diagram, 90 percent of all stars are _______________
Fill in the blank(s) with correct word
main sequence stars
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The formation of more protons than neutrons (at about a 7:1. ratio) was favored in the early universe because
A) it takes more energy to create a neutron from a proton than a proton from a neutron. B) it takes more energy to create a proton from a neutron than a neutron from a proton. C) the more massive neutrons made better targets for nucleon collisions. D) the positively charged protons were repelled away from the explosion.
Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere. b. far infrared photons are quite energetic. c. far infrared telescopes are not very heavy. d. far infrared sources are very bright. e. None of the other choices are correct.
The first spacecraft to return surface samples of an asteroid was named
A) Dawn. B) Stardust. C) Giotto. D) Hayabusa. E) NEAR.
Describe how Eratosthenes first measured the size of Earth over 2000 years ago
What will be an ideal response?