The source of energy that keeps the Sun shining today is ________.
A) gravitational contraction B) nuclear fusion
C) chemical reactions D) nuclear fission
Question 2
The number of confirmed extrasolar planets
A) is about 600, and is not expected to rise very much.
B) is about 800, and is rising slowly, as observations are quite difficult.
C) was about 800 at the time of publication but is rising rapidly due to new observations by the Kepler spacecraft.
D) has been decreasing as some observations thought to be planets have been disproven.
E) is zero; there are observations thought to be of extrasolar planets but none has yet been confirmed.
Cover and secure the cold source in place. Wrap the cold source using a towel or elastic bandage to ...
Ancient drawing of energy channels and acupoints.
Energy imbalance establishes a temperature gradient between the tropics and the poles
France has produced most of its energy from nuclear power since the oil crisis of the 1970s
The Contraction Cycle
Gravitational Force Due to a Distribution of Mass problem 2