Supernova remnants _____
a. always contain pulsars, because pulsars supply the ionizing radiation
b. often last longer than a pulsar does, so the central pulsar may no longer be visible
c. rarely contain pulsars, because pulsar radiation disrupts the remnant
d. may not contain a pulsar, if the supernova explosion kicked the pulsar away at high speed
e. never contain pulsars
d
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The planets all orbit in the same direction around the sun.
Indicate whether the statement is true or false.
Why do we think the first generation of stars would be different from stars born today?
A) Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse. B) Without heavy elements, the nuclear reactions at the center of the stars would be very different. C) Without heavy elements, there was no dust in the clouds and they collapsed faster. D) The Universe was much denser when the first stars were born. E) There were no galaxies when the first stars were born.
An absorption line spectrum, with dark lines crossing the rainbow of the continuum, is produced by a low-density hot gas
Indicate whether the statement is true or false
If 25 kg of ice at 0°C is combined with 4 kg of steam at 100°C, what will be the final equilibrium temperature (in °C) of the system?
a. 40 b. 20 c. 60 d. 100 e. 8