What is the source of the energy the Sun radiates to us?

A)

chemical reactions
B)

nuclear fission reactions
C)

nuclear fusion reactions
D)

magnetic explosions
E)

cosmic rays


C

Physics & Space Science

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If two stars have the same parallax, but the brighter is magnitude +2.3, and the fainter is magnitude +3.3, then the fainter star is ________ less luminous

Fill in the blank(s) with correct word

Physics & Space Science

About how long does it take a spacecraft to go from Earth to Jupiter?

a. a week b. a month c. a year d. several years e. several decades

Physics & Space Science

The ratio of the electric field to the magnetic field in the electromagnetic wave is the speed of the light

Indicate whether the statement is true or false

Physics & Space Science

The iridium layer at the Cretaceous-Tertiary boundary is attributed to

A) meteorite bombardment. B) massive volcanic eruptions. C) massive earthquakes and shock waves. D) extinction of the dinosaurs.

Physics & Space Science