At its equinoxes, Saturn's rings are most open and double the planet's brightness
Indicate whether the statement is true or false
FALSE
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Small icy bodies in the solar system which travel about the Sun in highly eccentric orbits and come from all directions are ________
Fill in the blank(s) with correct word
When is thermal energy trapped in the dense center of a cloud?
A) when the gravity becomes so strong that photons cannot escape B) when excited molecules collide with other molecules before they can release a photon C) when the cloud becomes so hot and dense that nuclear fusion begins D) when magnetic fields trap the radiation E) when the cloud cools down so much that less light escapes than is produced by contraction
The hot spots in a double-lobed radio source
a. appear to coincide with the location of the central galaxy responsible for the jets. b. are where hot excited gas interacts with the intergalactic medium. c. are only found near quasars. d. produce enough visible energy to be imaged at visible wavelengths. e. are always perpendicular to each other.
Absolute zero is the temperature of
A. frozen water B. the Universe C. liquid helium D. nothing