Which of the following is usually burned up in Earth's atmosphere?
a. Asteroid
b. Meteoroid
c. Meteor
d. Meteorite
c
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The Orion region contains young main sequence stars and an emission nebula, but the original molecular cloud they formed out of has been dispersed
Indicate whether the statement is true or false
Most meteorites are
A) carbon-rich and primitive. B) rocky and primitive. C) carbon-rich and processed. D) rocky and processed. E) iron-rich and processed.
Both spiral and elliptical galaxies seem to have dark halos of similar proportions relative to their visible matter
Indicate whether the statement is true or false
Why couldn't Newton determine the value of the gravitational constant?
a. The constant was too large to measure with existing instruments. b. The constant was too small to measure with existing instruments. c. If the gravitational constant were known, the mass of Earth could be calculated. d. Although Newton believed there was a constant, no one has ever discovered one. e. Although the right equipment and techniques for this measurement existed, Newton did not have access to them.