The spectra of interstellar gas clouds show that they have the same basic composition as
A) Earth's atmosphere.
B) stars.
C) asteroids.
D) interstellar dust.
E) the Martian polar caps.
B
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What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The larger redshifts originally indicated that they were orbiting the center of the Milky Way.
If you went to Mars, would you have to wear a space suit? Explain why or why not
What will be an ideal response?
Distant galaxies tend to be much bluer than those nearby
Indicate whether the statement is true or false
It is not necessary to separate metals from paper in the feedstock for a MSW energy plant
What will be an ideal response?