Consider an object in orbit around a star. The star suddenly shrinks in size, but does not change its mass. What happens to the object's orbit?
A) It is instantly ejected from its orbit.
B) It remains in the same orbit.
C) It settles into a smaller orbit, with similar distance from the surface as the original orbit.
D) It gradually spirals into the star.
B
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A car uses gasoline to convert
A) potential energy into radiative energy B) kinetic energy into potential energy C) radiative energy into kinetic energy D) potential energy into kinetic energy
In recent years, many planetary systems have been discovered around distant stars. This has been accomplished, not by direct observation of the planets themselves, but indirectly, by observing a wobbling motion in the star
Why is this wobbling motion evidence of a planet?
The scientist ______________ is generally regarded as "the father of geology."
Fill in the blank(s) with correct word
The Caloris Basin found on Mercury was probably formed by what process?
A. an impact from a planetesimal B. volcanic activity C. erosion from solar wind D. plate tectonics