1. Our favorite Solar System text p. 312-316

2. A solar system is a star and everything that orbits the star

3. Our sun is not the only star with planets: 150+ planetary systems
Two examples:
Upsilon Andromeda- very similar to ours
3 planets
PSR B solar system with two stars
1 planet

4. 1 AU = the distance from the Earth to the Sun .
Solar systems are small in space terms so they are measured using astronomical units
1 AU = the distance from the Earth to the Sun
1 AU= 150 million kilometers

5. Examples of using AU

6. Where did the solar system come from?
Our Solar System Came From A Nebula
Between 4 and 5 million years ago

7. Gravity caused the Nebula to Collapse

8. This Caused the Nebula to Begin Spinning

9. The Pressure Causes the Center to Ignite
The Sun is born!!!!

10. What about the planets?

11. Gravity pulled the left
over gas and dust from
the nebula together

12. Gravity pulls things towards the center
Making all the objects ROUND!!!!

13. Everything in the solar system is much smaller than the sun
The sun is 99% of all the mass in the solar system

14. The first 4 planets
Terrestrial
planets

15. Terrestrial planets are small compared to gas planets

16. Terrestrial planets are made of rock

17. Moons (planetary satelites)
Number of moons
Names
Mercury
Venus
Earth 1
moon
Mars 2
Phobos, Deimos

18. Outer planets
Sometimes
called
gas giants

19. Moons (planetary satelites)
Number of Moons
Names
Jupiter 62
Io, Europa, Ganymede, Callisto, Amalthea, Himalia, Elara, Pasiphae, Sinope, Lysithea, Carme, Ananke, Leda, Metis, Adrastea, Thebe, Callirrhoe, Themisto, Kalyke, Iocaste, Erinome, Harpalyke, Isonoe, Praxidike, Megaclite, Taygete, Chaldene, Autonoe, Thyone, Hermippe, Eurydome, Sponde, Pasithee, Euanthe, Kale, Orthosie, Euporie, Aitne, plus others yet to receive names
Saturn 33
Titan, Rhea, Iapetus, Dione, Tethys, Enceladus, Mimas, Hyperion, Prometheus, Pandora, Phoebe, Janus, Epimetheus, Helene, Telesto, Calypso, Atlas, Pan, Ymir, Paaliaq, Siarnaq, Tarvos, Kiviuq, Ijiraq, Thrym, Skadi, Mundilfari, Erriapo, Albiorix, Suttung, plus others yet treceive names
Uranus 27
Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania, Oberon, Caliban, Sycorax, Prospero, Setebos, Stephano, Trinculo, plus others yet to receive names
Neptune 13
Triton, Nereid, Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, plus others to receive names

20. Rings Terrestrial planets have no rings
Though Saturn is famous for its rings all gas planets have them.
Neptune Uranus

21. Objects besides planets

22. Asteroids are giant rocks orbiting the sun
They range in size from about the size of a classroom to
the largest which is
580 miles long

23. Asteroids
Most asteroids are in the
Asteroid belt between
Mars and Jupiter

24. Comets Comets are made of ice, rock and dust
Comets have very elliptical orbits around the sun

25. Comets
Comets have a tail when they are close to the sun because of the melting ice

26. What keeps the solar system all moving together?
The solar system started moving when the nebula started spinning
Gravity keeps all the objects together.

27. Main points Solar systems are a star and what orbits around it
Solar systems are measured using A.U.
In our solar system we have:
the sun
gas planets
terrestrial planets
moons (planetary satellites)
asteroids
comets