The core of the Sun is at a temperature of about 20,000 K
Indicate whether the statement is true or false
FALSE
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When the nuclear reactions begin making too much energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly. B) would increase its central temperature. C) would increase its density. D) would reduce the mass by a factor of 0.5.
Which of the following hypothetical universes would be the youngest, assuming that all are expanding at the same rate?
A) the one that has the most dark matter B) the nearly empty universe with no dark matter C) the one that has the most dark energy D) All of these universes would have the same age.
In a vacuum, the relative permeability is
A) zero. B) 4? × 10-7 T/A-m. C) 1.0. D) infinite. E) 8.99 × 109.
Our Sun will first become a red giant, then a white dwarf, and finally a brown dwarf
Indicate whether the statement is true or false