The planet in our solar system with the highest average surface temperature is
A) Venus.
B) Mercury.
C) Earth.
D) Neptune.
A
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In the context of light curves, observations of an eclipsing binary system can directly tell astronomers not only the masses of its stars but also their _____
A) orbital periods B) diameters C) intensity of magnetic fields D) temperatures
Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show redshifts greater than 6. d. are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. e. are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.
According to Newton, the gravity of the ________ is needed to explain planetary orbits
Fill in the blank(s) with correct word
Recently, superconducting wire was made using magnesium diboride (S. Jin, H. Mavoori, C. Bower, and R. B. Van Dover, "High critical currents in iron-clad superconducting MgB2 wires," Nature 411, 563 (2001))
This is assumed to hold the promise of cheap efficient energy transmission. Explain how this might be true.