Why do we call dark matter "dark"?
A) It blocks out the light of stars in a galaxy.
B) It emits no radiation that we have been able to detect.
C) It contains large amounts of dark-colored dust.
D) It is dark brown or dark red in color.
B
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Homogeneous mixtures are those mixtures that have variable but ______________ composition
Fill in the blank(s) with correct word
What is the angular resolution of the human eye?
A) about 1 arcminute, or 1/60 of a degree B) about 1 milliarcsecond C) about 1 arcsecond (1/3600 of a degree) D) about 1 degree
What types of observations are necessary to determine the motion of a star through space?
What will be an ideal response?
When dark matter first became popular, many astronomers thought that was greater than one from the extra gravity, favoring what type of Universe?
What will be an ideal response?