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
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A solar mass star will evolve off the main sequence when
A) it completely runs out of hydrogen. B) it expels a planetary nebula to cool off and release radiation. C) it explodes as a violent nova. D) it builds up a core of inert helium. E) it loses all its neutrinos, so fusion must cease.
During the time that a planet is in its period of apparent retrograde motion, ________
A) the planet is getting closer to the Sun in its orbit B) the planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west C) over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars D) the planet moves backwards (clockwise as viewed from above Earth's north pole) in its orbit of the Sun
One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm2. Then 100 milliliters of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.
What will be an ideal response?
The chromosphere of the sun has a higher temperature than the photosphere
Indicate whether the statement is true or false