Our solar system contains 8 planets that orbit our star, the Sun. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The Sun is over 4.6 billion years old and much larger than Earth. The Moon orbits Earth and has varying surface temperatures. Our solar system also contains asteroids, comets, and over 200 billion stars in our Milky Way Galaxy.

1. OUR SOLAR
SYSTEM
H A Y L E Y P L Y B O N

2. WHAT IS IN OUR SOLAR SYSTEM?

3. PLANETS
• Mercury
• Venus
• Earth https://www.youtube.com/watch?v=mQrlgH97v94
• Mars
• Jupiter
• Saturn
• Uranus
• Neptune

4. THE SUN
• Age: 4.6 Billion Years
• Type: Yellow Dwarf (G2V)
• Diameter: 1,392,684 km
• Circumference at Equator: 4,370,005.6 km
• Mass: 1,989,100,000,000,000,000,000 billion kg (333,060 x Earth)
• Surface Temperature: 5500 °C

5. THE MOON
• Circumference at Equator: 10,917.0 km
• Diameter: 3,475 km
• Mass: 73,476,730,924,573,500 million kg (0.0123 x Earth)
• Orbits: The Earth
• Average Distance from Earth: 384,400 km
• Length of Orbit: 27.3 Earth days
• Surface Temperature: -233 to 123 °C

6. STARS
• A star is a massive, bright, sphere of very hot gas called plasma which is held
together by its own gravity.
• There are approximately 200-400 billion stars in our Milky Way Galaxy alone.
• Stars are usually between 1 and 10 billion years old. Some stars may even be
close to the age of the observed Universe at nearly 13.8 billion years old

7. ASTEROIDS
• Asteroids are small Solar System bodies that orbit the Sun. Made of rock and
metal, they can also contain organic compounds.
• Asteroids are similar to comets but do not have a visible coma (fuzzy outline
and tail) like comets do.
• It is believed by many scientists and researchers that an asteroid impact was
the cause behind the extinction of the dinosaurs around 65 million years ago.

8. COMETS
• A comet is a very small solar system body made mostly of ices mixed with
smaller amounts of dust and rock.
• Most comets are no larger than a few kilometres across. The main body of the
comet is called the nucleus, and it can contain water, methane, nitrogen and
other ices.
• The periodic Comet Halley (1P/Halley) is the most famous in history. It returns to
the inner solar system once every 76 years.