A massive star may change its color and size notably, but its high luminosity remains fairly constant
Indicate whether the statement is true or false
TRUE
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Radio telescopes are important in astronomy because
a. they can detect cool hydrogen. b. they have high magnification. c. the can detect interstellar dust clouds. d. they are very inexpensive to build on tops of mountains. e. they don't need to be as large as optical telescopes to achieve the same resolving power.
The percentage (by number of atoms) of the Sun that is Hydrogen is about:
A) 91%. B) 71%. C) 27%. D) 9%. E) less than 1%.
Recent experiments suggest that the lifetime of the proton is over 1033 years, more than what is predicted by the simplest grand unified theories
a. True b. False Indicate whether the statement is true or false
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the sun to push this solar sail. If a huge sail of area 6.00 × 10^5 m2 and mass 6 000 kg were placed into orbit and turned toward the sun, what would be the force exerted on the sail? (Assume a solar intensity of 1 380 W/m2.)