When a low-mass star runs out of hydrogen in its core, it gets brighter. Why?
What will be an ideal response?
Without radiation pressure to inflate it, the core contracts again and heats up, making the hydrogen burning shell expand as well.
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Determine the moisture migration through the wall shown in Figure 8-32.
Which space mission orbited Jupiter and dropped a probe into Jupiter's atmosphere?
a. Pioneer b. Voyager c. Galileo d. Cassini e. New Horizons
The Caloris Basin on Mercury covers a large region of the planet, but few smaller craters have formed on top of it. From this we conclude that
A) erosion destroyed the smaller craters that formed on the basin. B) Mercury's atmosphere prevented smaller objects from hitting the surface. C) only very large impactors hit Mercury's surface in the past. D) the Caloris Basin formed toward the end of the solar system's period of heavy bombardment. E) the Caloris Basin was formed by a volcano.
Two point charges, Q and -3Q, are located on the x-axis a distance d apart, with -3Q to the right of Q
Find the location of ALL the points on the x-axis (not counting infinity) at which the potential (relative to infinity) due to this pair of charges is equal to zero.