Astronomers have identified more and more black holes in recent years by using x-ray imaging. If black holes are supposed to be black and not emit light, where are the x rays coming from?
b.
It has been well established that x rays are emitted by black holes. Scientists suspect that the radiation comes from superheated gas in orbit "falling into" the black hole.
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What is the galactic fountain model?
A) the idea that there is a lot of interstellar water vapor B) the theory that the Milky Way is a spiral galaxy and looks like a whirlpool from above C) the theory that hot, ionized gas blows out of the galactic center like a jet or fountain D) the theory that hot, ionized gas blown out of the galactic disk and into the halo by superbubbles cools down and falls back into the disk E) none of the above
A razor blade nicely shows diffraction fringes when illuminated with
A) ultraviolet light. B) monochromatic light. C) sunlight. D) all of the above E) none of the above
The Hawaiian Islands and the Emperor seamount chain were formed when the Pacific plate rode over a(n) ______________
Fill in the blank(s) with correct word
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. You carry a 20 N box 5 m horizontally across a room. The work you do is __________
Fill in the blank(s) with correct word