This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy.
B) The clumps are regions of extremely strong x-ray emission.
C) Each clump is the endpoint of one of the galaxy's spiral arms.
D) The clumps are globular clusters orbiting the center of the galaxy.
A) Each clump was probably once the center of an individual galaxy.
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If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would heat up, fusion rates would increase, the core would re-expand. B) The core would cool off and continue to shrink as its density increased. C) The density of the core would decrease, causing the core to cool off and expand. D) The core would heat up, causing it to radiate so much energy that it would shrink even more.
The ________ are two layers of charged particles trapped by our magnetic fields
Fill in the blank(s) with correct word
During operation of a nuclear reactor, the 238U nuclei
A) absorb neutrons, which causes them to turn into plutonium. B) slow down the neutrons, thus improving the efficiency of the reactor. C) absorb neutrons, which causes them to turn into fissionable 235U. D) absorb neutrons, which slows down the chain reaction and thus controls the reaction. E) are fissioned by the neutrons, thus releasing nuclear energy.
A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire
a. True b. False Indicate whether the statement is true or false