AP Psychology
3 min read•Last Updated on June 12, 2024
Gazing at distant galaxies is like peering into the universe's past. As light travels billions of years to reach us, we see galaxies as they were long ago. This cosmic time machine reveals how galaxies have changed over billions of years.
Early galaxies were smaller, more irregular, and formed stars at a frantic pace. They had fewer heavy elements and looked quite different from the majestic spirals and ellipticals we see nearby. Studying these ancient galaxies helps us understand how the universe evolved.
Term 1 of 33
Active galactic nuclei (AGN) refer to the extremely luminous and energetic centers of some galaxies, powered by supermassive black holes that are actively accreting matter. These galactic nuclei emit radiation across the entire electromagnetic spectrum, from radio waves to high-energy gamma rays, making them some of the most energetic phenomena in the universe.
Term 1 of 33
Active galactic nuclei (AGN) refer to the extremely luminous and energetic centers of some galaxies, powered by supermassive black holes that are actively accreting matter. These galactic nuclei emit radiation across the entire electromagnetic spectrum, from radio waves to high-energy gamma rays, making them some of the most energetic phenomena in the universe.
Term 1 of 33
Active galactic nuclei (AGN) refer to the extremely luminous and energetic centers of some galaxies, powered by supermassive black holes that are actively accreting matter. These galactic nuclei emit radiation across the entire electromagnetic spectrum, from radio waves to high-energy gamma rays, making them some of the most energetic phenomena in the universe.