What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy
B) the dust that fills the halo of the Milky Way galaxy
C) the middle section of the Milky Way galaxy
D) the name of an oracle who can channel messages from beings that live near the star called Vega
A) the gas and dust that lies in between the stars in the Milky Way galaxy
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A sidereal day is ______________ than a solar day
Fill in the blank(s) with correct word
A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.
The colonization of land by plants appears to have begun about
A) 542 million years ago B) 360 million years ago C) 65 million years ago D) 475 million years ago