Final answer:
The Crab Nebula, the aftermath of a supernova, is indeed about 10 light years in size and located approximately 6500 light years from Earth, shining brightly due to a central pulsar.
Step-by-step explanation:
The statement that the Crab Nebula is a cloud of glowing gas about 10 light years across, located about 6500 light years from Earth is true. The Crab Nebula is the remnant of a supernova that exploded nearly a thousand years ago and still shines with the energy of more than 100,000 Suns. This is possible due to the pulsar at the center of the nebula, which is a neutron star that emits beams of radiation. This pulsar is the "battery" that powers the nebula and contributes to its glow. The energy radiates at various wavelengths, and astronomers have been studying the complex relationship between the pulsar and the surrounding nebula's energy output.