How did Herschel try to map our Galaxy 200 years ago, and why did he fail?
What will be an ideal response?
His star counts revealed the galactic disk, but the dark nebulae of dust blocked everything except the closer spiral arms, making him think we lay near the center.
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What made most of the oxygen nuclei in the solar system?
A) stars B) Nothing makes elements–oxygen has always been present in the universe. C) the Big Bang D) our Sun E) high energy collisions of dust and cosmic rays
If the color spectrum ranges from red to violet, then it ranges from
A) low frequencies to high frequencies. B) long wavelengths to short wavelengths. C) both of these D) neither of these
The use of wave fronts and rays to describe optical phenomena is called
A) wave optics. B) geometrical optics. C) dispersive optics. D) quantum optics.
A stone is thrown straight up. What is its acceleration on the way up?
What will be an ideal response?