The planet that is most tipped to its orbital plane is
A) Mars.
B) Jupiter.
C) Saturn.
D) Uranus.
E) Neptune.
Answer: D
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A Young's double-slit experiment is performed, and the distance between bright fringes is d0 . If the experiment is repeated, this time under water, what is the relationship between the new distance between bright fringes, dw, and the original distance, d0?
a. dw < d0 b. dw = d0 c. dw > d0 d. Not enough information
Why was Herschel's strategy for mapping our Galaxy flawed?
A) His infrared telescopes couldn't penetrate the dust clouds. B) He used globular clusters, lying above the dust in the disc. C) He relied on visual wavelengths, which are obscured by dust. D) He used radio telescopes that didn't give enough resolution. E) He assumed Earth was at the extreme edge of the Galaxy.
As the radius of the orbit of an artificial satellite increases, its orbital period __________
Fill in the blank(s) with correct word
According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle
a. a supermassive black hole; an accretion disk b. a supermassive black hole; empty space c. no black hole; an accretion disk d. no black hole; empty space