Brown dwarfs are ____
a. stars with a very thick dust sphere around them, so they appear "brown"
b. low mass M type stars with hundreds of planets
c. an anomaly because they are extremely small but have relatively high temperature
d. protostars that could not ignite the fusion of hydrogen at their core
e. has a surface temperature of 2500 K by fusing hydrogen
d
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The Milankovitch cycles are
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Centaurus A is a radio galaxy that has a visible galaxy at the center. This central elliptical galaxy of Centaurus A is encircled by a ring of gas and dust, different from most elliptical galaxies. The dust ring orbits about an axis that is perpendicular to the axis of rotation of the elliptical galaxy. What does this suggest about this central elliptical galaxy of Centaurus A?
a. The radio jets have caused the dust disk to be driven around the elliptical galaxy. b. There are at least two black holes at the center of the elliptical galaxy. c. Centaurus A is probably the result of a merger of an elliptical galaxy and a spiral galaxy. d. Dust is produced as the jets interact with the intergalactic medium. e. Elliptical galaxies often contain dust that forms a disk along their rotation axis.
If you were in a spaceship traveling close to the speed of light with respect to Earth, you would notice that
A) some of your physical dimensions were smaller than normal. B) your mass was greater than normal. C) your mass was less than normal. D) your pulse rate was greater than normal. E) none of the above effects occur.
Outline the process of star formation, including all relevant factors that influence the outcome
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