Which planet is orbited by the four "Galilean moons" known individually as Io, Europa, Ganymede, and Callisto?

A) Saturn
B) Uranus
C) Mars
D) Jupiter
E) Neptune


D) Jupiter

Physics & Space Science

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Why does Ptolemy include epicycles in his model?

What will be an ideal response?

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As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about:

A) 12 hours. B) a week. C) two weeks. D) a month. E) 5.5 years.

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The absolute magnitude of a star is how bright it appears if viewed from a distance of ________ light-years

Fill in the blank(s) with correct word

Physics & Space Science

In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits simultaneously. A screen is placed 2.0 m from the slits

At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other? A) 1.5 mm B) 3.0 mm C) 4.5 mm D) 6.0 mm E) 9.0 mm

Physics & Space Science