Questions and Answers
Explain the difference between Dark Energy and Dark Matter.
Dark Energy is a hypothesized energy that is responsible for the universe's expansion, while Dark Matter is a hypothesized mass that explains faster rotating galaxies.
Describe the stages involved in the life cycle of a star.
The stages involved in the life cycle of a star include protostar, main sequence, red giant/ supergiant, planetary nebula, and white dwarf/ black hole/ neutron star.
How does gravity maintain circular orbits?
Gravity maintains circular orbits by exerting a force that pulls objects towards the center of the orbit, balancing the centrifugal force that pushes objects away from the center.
Study Notes
- Artificial satellites are man-made and used for imaging and communication.
- The Big Bang Theory is the accepted model for the origin of the universe.
- Circular orbits are maintained by gravity.
- Dark Energy is a hypothesized energy responsible for the universe's expansion.
- Dark Mass is a hypothesized mass to explain faster rotating galaxies.
- The Milky Way Galaxy is where our solar system is located.
- Natural satellites are moons that orbit planets.
- Nebulae are clouds of dust and gas.
- The star life cycle includes stages such as protostar, red giant, and supernova.
- The sun is a star that undergoes fusion reactions.
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