What evidence is there linking the Crab nebula to a supernova?
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Theory says that in a Type II supernova a small remnant of the core should remain as a neutron star. If you trace the expanding gas of the Crab nebula backwards in space and time you find all the gas started at one point a little less than 1000 years ago. We find a pulsar at that point, which is a neutron star. In 1054 A.D. the Chinese recorded a supernova in the sky at the location we now find this pulsar.
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Liquid nitrogen at 77.2 K (its saturation temperature) and 100 kPa is in a well-insulated flask having a surface temperature of 100 K. Estimate the convection heat transfer coefficient between the liquid nitrogen and the flask surface. The critical pressure of nitrogen is 33.54 atm.
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What reactions would start in its core?
A: Iron breaking into lighter elements B: Hydrogen fusing into Helium C: Oxygen burning D: Carbon burning E: None of the above
Compare the rotations and oblateness of Jupiter and Saturn
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Explain why "the dark side of the Moon" is an incorrect statement
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