How do medium stars die? Their remnants are

A: nova then white dwarf
B: supernova then white dwarf
C: planetary nebula then white dwarf
D: supernova then neutron star
E: supernova then black hole


Ans: D: supernova then neutron star

Physics & Space Science

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When a vapor condenses,

A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.

Physics & Space Science

Expressed in standard powers-of-10 notation and rounded to four significant figures, the number 0.00023648 is

a. 2.364 × 10^3. b. 2.365 × 10^4. c. 2.365 × 10^-4. d. 236.4 × 10^-6.

Physics & Space Science

The Miocene is a(n)

a. epoch. b. era. c. eon. d. period.

Physics & Space Science

The relative size of the mantle of Earth compared to the solid inner core of Earth is most similar to:

A) the peel of an orange as compared to the meat of the orange. B) the rind of a watermelon as compared to the meat of the watermelon. C) the skin of a grape as compared to the meat of the grape. D) the meat of a peach as compared to the pit of the peach. E) the meat of a cherry as compared to the pit of the cherry.

Physics & Space Science