Based on everything we have learned about Venus and Mars, what is the most surprising aspect of Earth's climate history?
A) the fact that the temperature of our planet has remained relatively steady throughout our planet's history
B) the fact that Earth apparently got a lot of atmospheric gas from outgassing by volcanoes
C) the fact that Earth had enough water to form oceans
D) the fact that Earth's climate can be affected by changes in its axis tilt
A
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How does a red giant compare to a main-sequence star of the same mass?
A) The red giant has higher surface temperature and higher luminosity. B) The red giant has higher luminosity but lower surface temperature. C) The red giant has lower surface temperature and lower luminosity. D) The red giant lower luminosity but higher surface temperature. E) Both stars have the same mass and therefore have the same surface temperature and luminosity.
Our best measurements from Earth indicate that the star system Alpha Centauri is 4.2 lightyears away. Suppose some of our astronauts traveled there at a speed v = 0.80c. What would the astronauts measure as the distance to Alpha Centauri?
a. 3.1 lightyears b. 7.0 lightyears c. 8.8 lightyears d. 2.5 lightyears e. 2.7 lightyears
What do scientists believe created the asteroid belt during Solar System formation?
What will be an ideal response?
A cork floats in an inverted jar sitting on a cart, as shown in the left diagram below. If we suddenly accelerate the cart to the right (as shown in the right diagram) what will the cork do:
A. Lean backward B. Remain vertically floating directly above the base C. Lean forward D. Sink E. Explode