Could we see a galaxy that is 20 billion light-years away? (Assume that we mean a "lookback time" of 20 billion years.)
A) no, because it would be beyond the bounds of our observable universe
B) yes, if we had a big enough telescope
C) no, because a galaxy could not possibly be that far away
D) Yes, we have already detected galaxies at that distance.
A) no, because it would be beyond the bounds of our observable universe
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Answer the following statement(s) true (T) or false (F)
If the value of h were bigger, it would be easier to display quanton interference effects.
The Oort Cloud is believed to have been formed by
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets. B) icy bodies formed between stars that have been captured by our solar system's gravity. C) moons that escaped from the jovian planets. D) debris from an icy planet that broke apart early in the solar system's history. E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
What is the light-gathering power of an 8-inch telescope compared to a 4-inch telescope?
A) 2× better B) 4× better C) 8× better D) 16× better E) 32× better
How does the modern value of Hubble's constant compare to Hubble's original published value?
A) They are very similar. B) The modern value is about 7 times lower than the original value. C) The modern value is about 7 times higher than the original value. D) The modern value is about 700 times lower than the original value. E) The modern value is about 700 times higher than the original value.