This photo shows gas associated with a protostar. What is this gas doing?
A) It is flowing outward in two opposite directions from the protostar.
B) It is gas that is gradually accreting onto the protostar.
C) It is part of a protostellar disk in which planets may someday form.
D) It is gas blown off the protostar's surface as a protostellar wind.
A) It is flowing outward in two opposite directions from the protostar.
You might also like to view...
Which of the following statements about halo stars is false?
A) Halo stars have random orbits about the Milky Way center. B) Halo stars are no longer being formed at the current epoch. C) All halo stars are less massive than our Sun. D) Halo stars are made entirely of hydrogen and helium with no heavy elements. E) Halo stars are some of the oldest known objects in the universe.
Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 ?N, what is the greater of the two currents?
A. 0.20 A B. 0.40 A C. 40 mA D. 20 mA E. 0.63 A
Suppose you sound a 1056-Hz tuning fork when you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string?
A) 1053 Hz B) 1054 Hz C) 1056 Hz D) 1058 Hz E) 1059 Hz
Heavier stable nuclei tend to have
A) half as many protons as neutrons. B) the same number of neutrons and protons. C) more neutrons than protons. D) no clear trend in the relative number of neutrons and protons. E) more protons than neutrons.