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During nuclear fusion, four hydrogen nuclei fuse into how many helium?
Q2: What does a refracting telescope use to
Q4: According to the theory of general relativity,
Q14: Visible light with wavelengths at the long-wavelength
Q16: What was Eratosthenes's mathematical contribution to the
Q19: Supernovae are _.<br>A) very common: there are
Q34: Galileo's book Dialogo strongly defended the work
Q41: A star with the mass of our
Q45: What is binding energy, and what physical
Q53: The Sun is what spectral type?<br>A) S2<br>B)
Q67: How can tidal forces affect the rotation