Which astronomical object emits hundreds of times more energy than most galaxies?

Quasars are among the most energetic and distant objects in the universe, emitting enormous amounts of energy that can exceed that of entire galaxies. They are powered by supermassive black holes at the centers of distant galaxies, where material falling into the black hole is heated to extreme temperatures, resulting in the production of intense radiation across the entire electromagnetic spectrum. This immense energy output is why quasars can be observed from billions of light-years away, providing insights into the early universe.

The other options, while interesting astronomical phenomena, do not match the energy scales achieved by quasars. Pulsars, for example, are highly magnetized rotating neutron stars that emit beams of electromagnetic radiation, but their energy output is much lower compared to quasars. Sunspots are temporary phenomena on the Sun's surface and do not release energy on the same scale. Supernova explosions do release significant amounts of energy, but they are events that occur sporadically within a galaxy rather than sustained emissions like those from quasars.