Planetary Report Card

Star Words

The terrestrial planets are the rocky planets closest to the sun: Mercury, Venus, Earth, and Mars. The jovian planets are the

> Sidereal period. The time it takes a planet to complete one orbit around the sun, usually expressed in Earth years.

Star Words

V Mass. The quantity of matter a planet contains. The mass of the earth is 5.977 x 1024 kg. We will assign the earth's mass the value of 1.0 and compare the masses of the other planets to it.

The terrestrial planets are the rocky planets closest to the sun: Mercury, Venus, Earth, and Mars. The jovian planets are the

> Radius. At the equator, the radius of the earth is slightly less than 6,400 km (3,963 miles). We will assign the radius of the earth a value of 1.0 and compare the radii of other planets to it.

gaseous planets farthest from the sun: Jupiter, Saturn, Uranus, and Neptune. Pluto is classed as neither terrestrial nor jovian.

V Number of known moons. Self-explanatory— an ever-changing number for the outer planets.

V Average density. This value is expressed in kilograms of mass per cubic meter. The substance of the inner planets is dense and tightly packed; in the outer planets, the densities are typically lower.

Semi-Major

Sidereal

Mass

Radius

Axis of Orbit

Period

(in Earth

(in Earth

Density

Planet

(in A.U.)

(in Years)

Masses)

Masses)

Moons

(kg/m3)

Mercury

G.39

0.24

0.055

0.38

G

5,4GG

Venus

G.72

0.62

0.81

0.95

G

5,2GG

Earth

1.G

1.0

1.0

1.0

1

5,5GG

Mars

1.5

1.9

0.11

0.53

2

3,9GG

Jupiter

5.2

11.9

318

11.2

16

1,3GG

Saturn

9.5

29.5

95

9.5

2G

7GG

Uranus

19.2

84

15

4.0

15

1,2GG

Neptune

3G.1

165

17

3.9

S

1,7GG

Pluto

39.5

249

0.003

0.2

1

2,3GG

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