Approximately what mass ratio is required for a rocket to leave the Earth's gravity?
A) 60
B) 99
C) 25
D) 39
D
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Since the difference in energy between the different rotational states in a molecule is very small, many molecular lines can be observed with:
A) visible light spectrometers. B) radio or microwave telescopes. C) high energy observatories like Chandra, in orbit above our atmosphere. D) ultraviolet balloons flying above the ozone layer. E) infrared telescopes on mountaintops.
Heat (Q) is the amount of _____________that is transferred from an area at high temperature to an area at low temperature.
Fill in the blank(s) with the appropriate word(s).
________________ is the closest star to Earth
Fill in the blank(s) with correct word
By mass, the interstellar medium in our region of the Milky Way consists of
A) 70% Hydrogen, 30% Helium. B) 70% Hydrogen, 28% Helium, 2% heavier elements. C) 70% Hydrogen, 20% Helium, 10% heavier elements. D) 50% Hydrogen, 50% Helium. E) 50% Hydrogen, 30% Helium, 20% heavier elements.