The supernova of 1054 AD produced
A) a remnant still visible to the naked eye, the Crab Nebula, M-1.
B) a pulsar with a period of 33 milliseconds, visible optically.
C) the closest known neutron star to our Sun.
D) the most famous black hole.
E) no remaining visible trace, as it was a type I supernova.
B
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Which of the following best describes what we mean by the term universe?
A) the sum total of all matter and energy B) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth C) all the galaxies in all the superclusters D) our Milky Way Galaxy
On December 21, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer
Why do nuclear reactions in a star occur only near its center?
What will be an ideal response?
If something falls into a black hole, it remains intact until it reaches the event horizon
Indicate whether the statement is true or false