How do high-mass stars make it more difficult for a molecular cloud to form more stars?
A) Strong winds push gas away.
B) Ultraviolet photons ionize the gas.
C) Ultraviolet photons heat the gas.
D) Radiation pressure pushes ionized gas away.
E) All of the above
E
You might also like to view...
At what angle is the orbit of the Moon around Earth inclined with respect to the orbital plane of Earth around the Sun?
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0 
105 N/m2. What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
A.
B.
105 N/m2, since it is at 1/3 the depth of the water.C.
105 N/m2, since it is at 2/3 the depth from the bottom of the container.D.
105 N/m2.E.
105 N/m2 + 9.8 
103 N/m2 since it is 1.0 m deep in the water.Suppose we represent Earth with a basketball. On this scale, most of the air in Earth's atmosphere would fit in a layer that is
A) about the thickness of a sheet of paper. B) about an inch thick. C) about 6 inches thick. D) about a half-inch thick.
A piece of glass that appears red
A) absorbs or reflects all colors except red. B) transmits red. C) both of these D) neither of these