| A | B |
|---|
| solar eclipse | When the Moon comes between the Sun and the Earth and blocks the Sun from reaching part of the Earth |
| lunar eclipse | When the Earth passes between the Sun and Moon and the Moon moves into the Earth's shadow |
| inner planets | rocky planets |
| outer planets | gas planets |
| red stars | coolest stars |
| blue- white stars | Hottest stars |
| yellow- orange stars | cooler stars |
| nebula | The cloud of gas and dust where a star is formed |
| hydrogen & helium | The main gases in stars |
| nuclear fusion | The process where the Sun converts Hydrogen to Helium and produces heat and light |
| solar prominence | Bright arch of flaming gas that rises up from Sun's surface and goes back down to it |
| solar flare | Powerful explosions which burst from sunspots |
| sunspot | Dark patches on the Sun's surface; areas where gases have broken through the surface |
| asteroid belt | Separates the inner planets from the outer planets |
| orbit | The path a planet takes around the sun |
| supergiants | Biggest stars of all |
| giants | large stars |
| dwarfs | smallest stars |
| supernova | The explosion that occurs when a large star dies |
| red giant | What a small or medium star becomes when it is dying |
| red supergiant | What a large star becomes when it is dying |
| 8 | The number of minutes it takes for light to reach Earth from the Sun |
| 9 | The number of planets in our Solar System |
| 93 million | How many miles away the Sun is from the Earth |
| 4.5 billion | How many years old the Sun is |
| galaxy | large group of billions of stars |
| year | The time it takes for a planet to travel around the sun |
