Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). What would happen to Earth in its orbit?
A) Earth would almost instantly be sucked into oblivion in the black hole.
B) Nothing; Earth's orbit would remain the same.
C) Earth would slowly spiral inward until it settled into an orbit about the size of Mercury's current orbit.
D) Earth would orbit faster, but at the same distance.
B
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The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy b. the fraction of stars with planets c. the number of planets per star in habitable zone longer than a few billion years d. the fraction of suitable planet where technical life forms evolve. e. All of the above.
Angular and Linear Quantities: A bicycle wheel has an outside diameter of 66 cm. Through what distance does a point on the rim move as the wheel rotates through an angle of 70°?
Fill in the blank(s) with the appropriate word(s).
Answer the following statement(s) true (T) or false (F)
The direction of the net force on a small magnet will be the same if the SG axis is reversed and the effect of the external magnet decreases in the axis direction instead of increasing.
The nearest star system closest to our Sun is about
A) 4 light years away. B) 20 light years away. C) 100 light years away. D) 40,000 light years away.