1. Jupiter

2.  Jupiter is the fifth planet from the Sun and by far the largest.  Jupiter is the fourth brightest object in the sky (after the Sun, the Moon and Venus ).

3. Density and volume  Jupiter is more than twice as massive as all the other planets combined  Jupiter has 1400 times the volume of earth but is only 318 times more massive. Thus, the mean density of Jupiter is about one- fourth that of earth  Jupiter probably has a core of rocky material amounting to something like 10 to 15 times Earth’s mass.

4. Atmosphere  The atmosphere is very deep, perhaps comprising the whole planet, and is somewhat like the Sun’s.  Jupiter is about 90% hydrogen and 10% helium with traces of methane, water, ammonia and "rock".

5. Temperature  Because of the temperature and pressure of Jupiter's interior, hydrogen is a liquid, not a gas. The liquid hydrogen is an electrical conductor and the source of Jupiter's magnetic field. This layer probably also contains some helium and traces of various “ices”.  Because of the low temperature of Jupiter’s upper atmosphere (-125  C/-193  F), white cirrus clouds form.  The temperature at the tops of these clouds is about -50  C (about -58  F), and the atmospheric pressure is about twice at sea- level on Earth.

6. "What if" the Earth and Jupiter exchanged places? For each planet in its new location, describe changes in the atmosphere and the surface.

7. Titan

8. Titan  Titan was the fifteenth of Saturn's satellites found.  It is the largest of Saturn ’ s moons.  Titan has an orange glow from its photochemical smog, rich in organic material.

9. Atmosphere  Titan's atmosphere is so thick and hazy that its solid surface is slightly smaller than Ganymede’s. Titan is nevertheless larger in diameter than Mercury and larger and more massive than Pluto.  Titan does have an atmosphere. At the surface, its pressure is more than 1.5 bars (50% higher than Earth's). It is composed primarily of molecular nitrogen (as is Earth's) with no more than 6% argon and a few percent methane.

10. Surface  Titan’s surface temperature appears to be about -178  C (-289  F).  The surface is about half water-ice and half rocky material.

11. "What if" you traveled in a space craft to Saturn's moon Titan. What type of vehicle might you need to move about on the surface of this moon?