Astronomers have used observations from the Hubble Space Telescope to measure the rate at which the universe is expanding, and have estimated the age of the universe from that measured rate. Suppose the expansion turns out to be faster than current measurements indicate. In that case, our new estimate for the age of the universe would be
A) unaffected.
B) younger (less time between now and the Big Bang).
C) older (more time between now and the Big Bang).
B) younger (less time between now and the Big Bang).
You might also like to view...
Extra mass dumped on a white dwarf creates a nova, but if dumped on a neutron star, it creates
A) a millisencond pulsar. B) an X-rays burster. C) a black hole. D) a gamma-ray burster. E) a pulsar.
You observe a galaxy that is 100 million light-years away. Which of the following do you see?
A) The light from the galaxy as it is today, and it is blueshifted. B) The light from the galaxy as it is today, and it is redshifted. C) The light from the galaxy as it was 100 million years ago, and it is blueshifted. D) The light from the galaxy as it was 100 million years ago, and it is redshifted. E) Nothing: the galaxy lies beyond the cosmological horizon.
This diagram shows an electron and an antielectron (positron) being created from nothing, then annihilating themselves back into nothing. According to our understanding of quantum physics, which statement about this process is true?
A) This creation of something from nothing is permitted by the uncertainty principle, as long as the particles return to nothingness in a short enough time. B) The process shown is impossible because it would violate the law of conservation of energy. C) The diagram must be missing something, such as photons coming in on the left and going out on the right. D) This process can occur only near a black hole.
When you add heat to ice, its temperature always stays constant
a. True b. False Indicate whether the statement is true or false