Which of these were observed from Earth, prior to spacecraft missions to Mars?
A) seasonal changes in the polar caps
B) eruptions of Mount Olympus
C) dust storms capable of covering the entire planet
D) Both A and C are correct.
E) All of the above are correct.
D
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What is the distinguishing characteristic of what we call ordinary matter (such as the matter that makes up stars, planets, and people)?
A) It is made of subatomic particles that scientists call WIMPs. B) It emits a great deal of light. C) It consists of atoms or ions with nuclei made from protons and neutrons. D) It can attract other matter through the force of gravity.
Which of the following is true of the apparent blackbody radiation emitted by the big bang?
A) It should now be in the far-infrared and radio parts of the spectrum. B) It should now be in the far-infrared and ultraviolet parts of the spectrum. C) It should now be in the near-infrared and radio parts of the spectrum. D) It should now be in the near-infrared and ultraviolet parts of the spectrum.
Stars of spectra type K have strong Balmer lines
a. True b. False Indicate whether the statement is true or false
Which component of Earth's geology has helped to shield the Earth's atmosphere from energetic particles of solar wind from the Sun which would have gradually stripped it away into space?
A) volcanism B) seismic activity C) plate tectonics D) global magnetism