Main sequence stars are fusing hydrogen into helium in their cores
Indicate whether the statement is true or false
TRUE
You might also like to view...
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) Planets that are close to a star are heated up and therefore larger. B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. C) The hydrogen and helium gas compressed under their own gravity. D) It is made of elements other than hydrogen and helium which do not compress under their own gravity.
Natural processes tend to increase the entropy of thermodynamic systems
a. True b. False Indicate whether the statement is true or false
Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water. b. The bubbles' pressure increases as they rise. c. The pressure in the water decreases as the bubble moves toward the surface. d. Bubbles always get bigger after they form.
The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere does the temperature of the sun change the most rapidly with distance?
a. 1,000 km
b. 2,300 km
c. 2,500 km to 4,000 km
d. 400 km
e. a and c