10 Concepts that Prove You Actually Know Astrophysics

1. Event Horizon is basically the boundary in a black hole and beyond it, nothing returns, not even light. The gravity becomes so strong not even light photons can escape it!

2. Red shift Light has it's wavelengths, visible light is what we see and then there is ultra violet and infrared, our universe is expanding faster than speed of light, means the galaxies far away get pulled from us faster than light which "stretches" the waves of visible light until it becomes infrared we can no longer see.

3. Chandrashekhar limit is the maximum mass a stable white dwarf star can have, and it is 1.44x of our sun.

4. Cosmic microwave background is basically the leftover radiation of the universe after the big bang which fills the entire observable universe.

5. Gravitational lending happens when a massive gravitational object like a black hole bends the space time fabric so much that light has to change its path around the object.

6. Dark matter is the "mysterious" matter that makes up approximately 27% of total mass and energy and 85% of the existing physical matter of the universe, but we don't know what exactly it is because light doesn't interact with it at all, we know it's there.

7. A standard candle is an object that has a known luminosity and we know it's true brightness.

8. Roche limit is basically the boundary around a planet where a natural satellite can safely orbit before the planet's gravity becomes strong enough to collapse it.

9. Pulsars are fast rotating and highly magnetized neutron stars which emit electromagnetic radiation.

10. Astronomical units define the distance between the Earth and the Sun which is approximately 150 million Kilometres.