The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres.
b. search for absorption from oxygen in their atmospheres.
c. search for emission lines from water vapor in their atmospheres.
d. search for carbon dioxide on their moons.
Ans: b. search for absorption from oxygen in their atmospheres.
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The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing d between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the shortest wavelength ?? The white spaces represent the interference maxima.
A. I. B. II. C. III. D. IV. E. V.
The central engine for active galaxies is believed to be a(n) ________
Fill in the blank(s) with correct word
If stars existed but galaxies did not:
A. We would probably still exist anyway. B. We would not exist because life on Earth depends on the light produced by galaxies. C. We would not exist because we are made of material that required recycling in galaxies.
In what constellation is the Sun be located at the moment of the March equinox?
A) Pisces B) Aries C) Orion D) Taurus E) Andromeda