The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy
Fill in the blank(s) with correct word
galactic corona
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Why do astronomers think Earth ended up with so little CO2 compared with Mars and Venus?
A. Volcanoes on Earth outgassed less CO2 than on Venus and Mars. B. Pollution on Earth has reduced the amount of CO2 originally present. C. Plant life and abundant water have removed most of the CO2, locking it into rocks and the oceans. D. Comets striking the surfaces of Venus and Mars added CO2 to their atmospheres, but not to Earth.
Asteroid 433 Eros is one of the largest near-Earth asteroids. For purposes of this problem, assume it is spherical. The value of g at its surface is 0.0060 m/s2 and the escape velocity is only 10.1 m/s. What is the mass of Eros? G = 6
67 x 10-11 N•m2/kg2. A) 2.3 × 1016 kg B) 3.5 × 1012 kg C) 6.5 × 1015 kg D) 4.9 × 1014 kg E) 6.7 × 1013 kg
DNA is important to a cell because
a. DNA is the cell membrane that allows nutrients to enter the cell and waste to leave. b. DNA contains the information necessary to make all of the molecules required by the organism. c. DNA contains the information necessary for the cell to reproduce itself. d. all of the above e. b and c above
In Heisenberg's formula, ?p ?x? h, the h symbolizes
A) Planck's constant. B) an average value of Planck's constant. C) the peak value of Planck's constant. D) Planck's constant divided by 2?. E) none of the above