Although it is almost the same size as Jupiter, Saturn's gravity is about 2.5 times less, because of Saturn's lower mass and density

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere ("aerobraking") before settling into their final orbits?

A) It saved money because the spacecraft used atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines. B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere. C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth. D) Each spacecraft also carried a lander, and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.

Physics & Space Science

Which of the following contributes to the problem of greenhouse-effect heating of the atmosphere?

A) Coal-burning power plants B) Gasoline-fueled automobile engines C) Both of the above. D) Nuclear power plants E) All of the above.

Physics & Space Science

Metal lids on glass jars can often be loosened by running them under hot water. Why is this?

a. The hot water is a lubricant. b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal. c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection. d. This is just folklore.

Physics & Space Science

Six months of darkness at the South Pole begins when the Sun is at the

a. winter solstice. b. summer solstice. c. autumnal equinox. d. vernal equinox.

Physics & Space Science