Examlex
A black hole may be visible because electromagnetic radiation is emitted from a(n)________ surrounding it, heated up enough to emit X-rays.
Q14: Supernova 1987A provided an important confirmation of
Q25: Relatively long duration gamma-ray bursts are produced
Q25: The core of the Milky Way, Sagittarius
Q48: Some of the invisible matter in our
Q69: If the geometry of the universe can
Q78: An emission nebula appears primarily _ in
Q91: Which of the following is true about
Q97: Why can radio waves get through the
Q104: The gas density in an emission nebula
Q107: Virtually all the carbon-rich dust in the