An EM wave with a wavelength of 500 nm will be visible
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A starburst galaxy gets this name because
A) it contains far more x-ray bursters than our Milky Way Galaxy. B) it has many stars bursting out of its disk toward intergalactic space. C) it is forming stars so fast that the starburst phase of life must be temporary. D) it contains so many stars that the galaxy's gravity cannot retain them in their orbits.
Our Sun should become a planetary nebula in another five billion years
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The Crab Pulsar is pulsing in visible light 30 times per second. Why?
A) A jet ejects energy and particles from a hot spot 30 times per second. B) It rotates 30 times per second. C) It is eclipsed by a companion 30 times per second. D) It's a mystery; no one really knows.
What do we mean by a primitive meteorite?
A) a piece of rock that is essentially unchanged since it first condensed and accreted in the solar nebula some 4.6 billion years ago B) a meteorite that was discovered by primitive people C) a meteorite that fell to Earth at least 4 billion years ago D) a type of meteorite that is usually made mostly of high-density metals