What is the difference between astronomy and astrophysics?
Technically speaking, astronomy is the science of measuring the positions and characteristics of heavenly bodies, and astrophysics is the application of physics to understand astronomy. However, nowadays, the two terms are more or less interchangeable since all astronomers use physics to understand their findings.
Astrophysics is a sub-branch of astronomy to deal with physics of celestial objects and phenomena. The explanation waited for very long which required quantum physics to come. Cosmology talks about universe as a whole which includes origin, evolution and ultimate fate of the universe.
- All in all, Hubble reveals an estimated 100 billion galaxies in the universe or so, but this number is likely to increase to about 200 billion as telescope technology in space improves, Livio told Space.com.
- In physical cosmology, the dark-energy-dominated era is proposed as the last of the three phases of the known universe, the other two being the matter-dominated era and the radiation-dominated era.
- There's three possible fates for the universe, one is called the Big Crunch, where gravity takes over and begins to pull the cosmos back, compressing to one point. Another extreme is the Big Rip, where the expansion of the universe just gets faster until galaxies, stars, planets, atoms and space itself is ripped apart.
Astrophysics is a branch of space science that applies the laws of physics and chemistry to explain the birth, life and death of stars, planets, galaxies, nebulae and other objects in the universe. It has two sibling sciences, astronomy and cosmology, and the lines between them blur.
- A religious cosmology (also mythological cosmology) is a way of explaining the origin, the history and the evolution of the cosmos or universe based on the religious mythology of a specific tradition. Religious cosmologies usually include an act or process of creation by a creator deity or a larger pantheon.
- The distinction is that they are titles awarded by different space agencies. They both mean essentially the same thing and they both come from Greek. Cosmonaut is used by the Russian Space Agency. Astronaut is used by NASA, ESA, CSA, and JAXA.
- Russian cosmonauts celebrate with cognac aftera fire emergency on the Mir space station. Alexander Lazutkin is on the far right. The picture was taken by NASA astronaut Jerry Linenger, who did not drink. As it turns out, there is some scientific evidence for the benefits of alcohol in space.
Updated: 2nd October 2019