There is evidence that a collision between a spiral and an elliptical galaxy has produced a radio galaxy
Indicate whether the statement is true or false
TRUE
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An absorption _________is the sharp increase in absorption that occurs when the energy of a photon is sufficient to excite an electron from one energy level to another.
Fill in the blank(s) with the appropriate word(s).
A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16 cm high steps a 70 kg athlete could ascend in one minute while expending one horsepower is
a. 4. b. 7. c. 65. d. 408. e. 4 567.
A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits?
A) Planet 2's semimajor axis is larger than Planet 1's. B) Planet 1's orbit is more eccentric than Planet 2's. C) Planet 2's orbit is more eccentric than Planet 1's. D) Planet 1's semimajor axis is larger than Planet 2's.
Astronomers think most galaxy interactions took place at redshifts of greater than 1 because:
A) stars were bigger. B) galaxies were bigger. C) galaxies were smaller. D) clusters were more diffuse. E) clusters were more compact.