Since brown dwarfs cannot ignite hydrogen fusion, how might we hope to spot them? What role does deuterium play in this?
What will be an ideal response?
In the Kelvin-Helmholtz contraction, they will become hot and luminous enough to give off detectable red light, but not for long, so you should look for them in star forming regions. Also, more massive ones than 12 Jupiters can shine briefly by deuterium fusion, but as the supply of deuterium is very limited, that process too will not last long.
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A mercury manometer measures a pressure of 150 mmHg. What is this pressure in kPa?
A. 12 B. 15 C. 20 D. 24 E. 29
Which of the following best describes why we have seasons on Earth?
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year. B) Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others. C) The tilt of Earth's axis causes the Northern Hemisphere to be closer to the Sun than the Southern Hemisphere in summer, and vice versa in winter. D) The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest.
If bulb C were unscrewed: _________
a. bulb A and bulb B would be equally bright. b. bulb A would be brighter than bulb B. c. bulb A would be dimmer than bulb B. d. bulb A would go out. e. bulb B would go out.
The ability of a telescope to separate two closely spaced stars is called ________
Fill in the blank(s) with correct word