Seyfert galaxies are spiral galaxies with active cores
Indicate whether the statement is true or false
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The Earth's atmosphere blocks most forms of electromagnetic radiation from entering except for ____________________ and ____________________
Fill in the blank(s) with correct word
A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given b) stars are approximately the same brightness c) the 16 solar mass main sequence star d) depends on the phase of the Moon e) the 1 solar mass main sequence star
What is the Cassini division of Saturn's rings?
A) a dark ring, visible from Earth, composed of dark, dusty particles B) a large gap, visible from Earth C) the imaginary circle marking the halfway point of Saturn's rings D) the widest ring of Saturn, located between two large ring gaps E) the most opaque ring of Saturn, made of highly reflective ice particles
Why isn't there a planet where the asteroid belt is located?
A) There was not enough material in this part of the solar nebula to form a planet. B) A planet once formed here, but it was broken apart by a catastrophic collision. C) Gravitational tugs from Jupiter prevented material from collecting together to form a planet. D) There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. E) The temperature in this portion of the solar nebula was just right to prevent rock from sticking together.