What objects are sometimes called "failed stars"?
A: NNFOs (No Nuclear Fusion Objects)
B: EGGs (Evaporating Gaseous Globules)
C: Brown Dwarfs
D: Bok Globules
E: None of the above
Ans: C: Brown Dwarfs
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Thermodynamic Processes: The figure shows a pV diagram for 2.6 g of ideal helium gas that undergoes the process 1 ? 2 ? 3. Find the value of volume V3. The atomic mass of helium is 4.0 g/mol, and R = 8.31 J/mol ? K.
A. 25 L B. 99 L C. 50 L D. 12 L
The absolute moisture content of the air is 7.7 g/ft3 on a day when the air temperature is 75°F. What is the relative humidity?
A__________is a type of active galaxy nucleus that is especially variable and has few or no spectral emission lines
A) blazar B) pulsar C) quasar D) quark
What is the primary reason that we launch X-ray telescopes into space rather than building them on the ground?
A. It is less expensive to launch them into space. B. On the ground, there would be too much light pollution from nearby cities. C. Atmospheric turbulence blurs X-ray images too much. D. X-rays from space do not reach the ground.