What is the solar wind?
A) the uppermost layer of the Sun, lying just above the corona
B) the strong wind that blows sunspots around on the surface of the Sun
C) the wind that causes huge arcs of gas to rise above the Sun's surface
D) a stream of charged particles flowing outward from the surface of the Sun
D
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Precession of Earth's axis causes the date at which perihelion of Earth's orbit occurs to slowly change
a. True b. False Indicate whether the statement is true or false
Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
Stars are born in
a. reflection nebulae. b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble.
The angular speed of the hour hand of a clock, in rad/s, is
A.
.B.
.C.
.D.
E.