The two spacecraft constantly observing the Sun are ________ and ________
Fill in the blank(s) with correct word
SOHO; SDO
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From Kepler's third law, an asteroid with an orbital period of 8 years lies at an average distance from the Sun equal to
A) 16 astronomical units. B) 4 astronomical units. C) 8 astronomical units. D) 2 astronomical units. E) It depends on the asteroid's mass.
A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because
A. no net force acts on the body. B. no force acts on the body. C. it is the nature of the body to slow down by itself. D. a net force acts on the body.
Where does the 21-cm radiation arise?
What will be an ideal response?
How would you "weigh" the astronauts in orbit (where they feel weightless) so that you can keep them in good health?
What will be an ideal response?