What observational evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) Some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies.
B) Elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies.
C) Elliptical galaxies with stars and gas clouds that orbit differently from the other stars in the galaxy.
D) There are giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies.
E) All of the above are correct.
E) All of the above are correct.
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Refracting telescopes suffer from ____________________ aberration
Fill in the blank(s) with correct word
In general terms, how do the temperature structures of the atmospheres of Venus and Mars differ from that of Earth?
A) They lack ultraviolet-absorbing stratospheres. B) They lack X-ray absorbing thermospheres. C) Their atmospheres are similar in structure to Earth's but with much higher temperatures. D) Temperatures in their tropospheres increase with altitude, rather than decreasing with altitude.
Compared to Saturn, Jupiter is about
A) 100 times more massive. B) twice the diameter, but less dense. C) half as dense, but the same mass since it is larger. D) three times more massive and denser. E) half as massive and denser.
What accounts for the additional few minutes of sunlight we experience daily, before sunrise and after sunset?
What will be an ideal response?