When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang
b) as it was 3.2 years ago as it was when the light left this galaxy
c) as it is now because light travel instantaneously
d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
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Because of their low surface gravities, the Moon and Mercury lack ________
Fill in the blank(s) with correct word
Light is incident on a double-slit. The fourth bright band has an angular distance of 7.0° from the central maximum. What is the distance between the slits (in ?m)? (Assume the frequency of the light is 5.4 × 10^14 Hz.)
a. 27 b. 21 c. 24 d. 18 e. 14
If a planet orbits the Sun at a distance of 4 AU, then its orbital period is 8 years
a. True b. False Indicate whether the statement is true or false
Astronomers observe huge bubbles of hot gas, some over a thousand light years across, in the Milky Way. What is their cause?
What will be an ideal response?