As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases
A) because thermal energy is converted to radiative energy.
B) because kinetic energy is converted to radiative energy.
C) because gravitational potential energy is converted to thermal energy.
C
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Earth's "greenhouse effect" problem is important because
A) it is a result of our use of nuclear energy, one of our prime sources of energy. B) it could cause increased skin cancer. C) it might warm up our entire planet. D) we must breath CO2 in order to live. E) CO2 is a toxic pollutant.
The Saturnian moons of most interest to exobiologists are
A) Rhea and Iapetus. B) Phoebe and Dione. C) Mimas and Tethys. D) Hyperion and Miranda. E) Titan and Enceladus.
Astronomers use theory to determine the temperature of the Sun's core, because they cannot measure the core temperature directly.
Answer the following statement true (T) or false (F)
When studying light, a nanometer is a unit
used for a) resonance. b) frequency. c) wavelength. d) loudness.