What common gas assumes an uncommon state in the mantles of Jupiter and Saturn? Why?
What will be an ideal response?
Hydrogen. On Earth hydrogen is a gas because of the pressure and temperature in our atmosphere. On Jupiter and Saturn, it can be liquid and have the properties of a metal because of the much higher temperatures and pressures.
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What causes the geological activity seen on some of the inner moons of Jupiter?
a. Constant collisions with space debris provide a power source for geological activity. b. The strong magnetic field of Jupiter heats the surface of the inner moons. c. Tidal friction as a result of being so close Jupiter heats their interiors. d. Solar radiation reflected of Jupiter's surface provides a power source for geological activity.
Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative
to their own ship? a. 0.36c b. 0.60c c. 0.64c d. 0.80c e. 1.25c
______________ dating is used specifically to establish the absolute age of organic remains
Fill in the blank(s) with correct word
Why do O stars exhibit weak hydrogen absorption lines?
A) At these high temperatures, nearly all the hydrogen is ionized, and is therefore unable to interact with light. B) O stars are too cool to excite hydrogen atoms to the first energy level from which they can then absorb visible wavelengths of light. C) O stars contain very little hydrogen.