# Introduction to Astronomy HW02
###### tags: `NTNU` `通識` `Science and Life` `Introduction to Astronomy`
1. Solar System
- a. objects closer to the Sun than Jupiter
- Jupiter , Io , Europa , Ganymede , Callisto , Ceres , Mars , Earth , Venus , Mercury , Halley's-Comet .
- b. atmosphere more than 1 mbar
- Venus, Titan, Saturn, Earth, Mars, Jupiter, Uranus, Neptune
- c. moons
- Io, Europa, Ganymede, Callisto, Titan, Enceladus, Triton, Charon
2. Extanded Solar System
- a. Why Pluto not a planet anymore？
- it is too small
- its moon too big
- its orbit is moderately and eccentric
- b. What is KBO ？
-
3. Tool
- a.
- b.
4. Stars
- What is H-R diagram ? what is x axis ? What is y axis ?
- To see the state of the star.
- X-axis means surface temperature.
- Y-axis means luminosity.
5. Strange stars
- a.
- b.
6. Exoplanet

[Solar System Note](https://hackmd.io/@NTNUCSIE112/solarsystemnote)
{%hackmd @NTNUCSIE112/solarsystemnote %}
[Telescopes Note](https://hackmd.io/@NTNUCSIE112/Telescopes)
{%hackmd @NTNUCSIE112/Telescopes %}