The planets
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THE PLANETS. Goal: To learn (review?) basic information about the 8 planets and the minor planets of our solar system. Please be in your seat and have a pencil or pen. Notebooks.

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The planets


Goal: To learn (review?) basic information about the 8 planets and the minor planets of our solar system.

Please be in your seat and have a pencil or pen.


  • FYI – we will be beginning Geology soon, so if you do not have a notebook anymore (for whatever reason), or your old one is filling up, you will want to get a new one by MONDAY, Feb 3.

  • I do not have many more to hand out, so if you need assistance acquiring a notebook, please talk me after class or your counselor.

Size distance
Size & Distance system, what do you see?

  • Most diagrams of our Solar System are not to scale

  • Also, most diagrams do not include the “minor planets” or the Asteroid Belt.

  • You’ve studied the Solar System in lower grades, so this is just a review.

  • We will create a chart for this information, but first, look over the next few slides and keep these in mind while we’re working on this lesson.

Scaled sizes of planets
Scaled sizes of planets system, what do you see?

Distances notice it stops at saturn
Distances system, what do you see?– notice it stops at Saturn!

Planets dwarf planets click below for a 3 20 video
Planets & Dwarf system, what do you see?Planets click below FOR a 3:20 video

Planets system, what do you see?

  • There are eight planets

  • The “Inner Planets” – Mercury, Venus, Earth, & Mars are also called “Terrestrial Planets” (Terra mean soil)

Planets system, what do you see?

The “Outer Planets” – Jupiter, Saturn, Uranus, & Neptune are also called “Gas Giants”

Dwarf or minor planets
Dwarf system, what do you see?(or Minor) Planets

  • There are three: Ceres, Pluto, and Eris

  • Ceres is the smallest and is located in the Asteroid Belt between Mars and Jupiter

  • You know about Pluto, formerly considered the ninth planet, now known officially as asteroid #134340

  • Eris is an ice ball, officially knows as 2003 UB313. It was originally nicknamed Xena after a TV character.

  • These changes happened in 2006

Your chart our solar system
Your chart: “Our Solar System” system, what do you see?

  • Keep your paper in “Portrait”

  • Use the ruler to draw a line about every 1.5 inches

  • You can sketch and color picture of the planet

  • It’s OK if you need to continue on the back of the paper –

  • Headings +8 planets + 3 dwarf planets + 5 others = 16 rows (make 2 columns)

Mercury system, what do you see?

  • Mercury has virtually no atmosphere. It however has small traces of an atmosphere .

  • It takes less than 88 Earth days for Mercury to orbit around the sun which is its year.

  • Because of a lack of an atmosphere, the temperature rises above 800°F while on the dark side it falls rapidly to -300°F.

  • Mercury rotates slowly on its axis. It completes one rotation every 59 Earth days which is its day.

  • The surface of Mercury is heavily cratered, looking much like our moon.

  • Mercury does not have a natural satellite (a moon)

Mercury system, what do you see?

Venus system, what do you see?

  • Its atmosphere is made up mostly of carbon dioxide which causes a run away greenhouse effect and the planet is around 900 degrees F. It is the hottest planet.

  • It takes 243 days to make a rotation and it takes 224 days to orbit around the sun. This makes its day longer than its year

  • The planet rotates from East to West which is called retrograde rotation.

  • Venus does not have a natural satellite (a moon)

Venus system, what do you see?

  • Click for 2 min video on atmosphere ->

Earth system, what do you see?

  • It is made up of approx. 70% water

  • Only planet known to contain life

  • The densest planet

  • Day = 24 hours

  • Year = 365.25 days

Earth system, what do you see?

The planets
Mars system, what do you see?

  • It is red because there is a lot of iron in the soil

  • Mars year = 687 Earth days.

  • Nighttime temperatures on Mars can drop as low as -191°F.

  • The thin atmosphere is made of mostly carbon dioxide.

  • Mars has seasons like Earth.

  • Mars has two moons.

Asteroid belt
Asteroid Belt system, what do you see?

  • The Asteroid Belt is a region between the inner planets and outer planets where thousands of asteroids are found orbiting around the Sun.

  • More than 7000 asteroids have been discovered. Several hundred more are discovered each year. There are undoubtedly hundreds of thousands more that are too small to be seen from the Earth.

The planets

Ceres 1:34

  • This dwarf planet is one of the largest asteroids in the Asteroid Belt

  • Scientists describe Ceres as an "embryonic planet." Gravitational perturbations from Jupiter billions of years ago prevented it from becoming a full-fledged planet.

  • Ceres ended up among the leftover debris of planetary formation in the main asteroid belt between Mars and Jupiter.

Jupiter 1:34

  • It rotates faster than any planet making the days only 10 hours long.

  • It is the largest planet.

  • Its has 67 confirmed moons!

  • It has the biggest moon in the Solar System, Ganymede.

  • It has a ring.

  • The Great Red Spot is a storm that has been going on for over 300 years.

  • The Great Red Spot is large enough to contain 2 to 3 planets the size of Earth

Saturn storm)

  • It has the lowest density of all the planets.

  • It has over 60 known satellites

  • Its rings are made up of billions of pieces of rocks, ice and dust.

  • Titan is the only Saturn moon with an atmosphere.

Saturn storm)

Uranus storm)

  • Uranus is the coldest planet in the solar system.

  • It is tilted completely on its side so the equator runs north to south because of impact from an asteroid .

  • It is the blue-green planet because of its methane gas.

  • It has rings.

Uranus storm)

Neptune storm)

  • Neptune is the stormiest planet.

  • The planet has a system of thin dark rings .

  • Neptune has 8 known moons.

Neptune storm)

Pluto click below for 3 31 video about minor planets
Pluto storm) click below for 3:31 video about minor planets

  • Pluto, is now considered a "dwarf planet." A dwarf planet orbits the sun just like other planets, but it is smaller. A dwarf planet is so small it cannot clear other objects out of its path.

  • Pluto travels an oval pathway around the Sun.

  • The dwarf planet has three moons. Its largest moon is named Charon (KER-ən). Charon is about half the size of Pluto.

More dwarf planets
More Dwarf Planets storm)

  • There are more dwarf planets – most beyond Pluto’

  • Some have tiny moons

Meteoroids meteors
Meteoroids & Meteors storm)

  • Meteoroid - any of the small solid extraterrestrial bodies that hits the earth's atmosphere

  • Meteor - a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode

  • Meteorite – any part of a meteoroid that survives the fall and reaches the planet’s surface

Asteroids storm)

  • The Asteroid Belt is between Mars & Jupiter, but asteroids can be anywhere in the solar system.

  • A class of small bodies in orbit around the sun.

  • They are smaller than planets & sometimes called minor planets or planetoids.

  • They’re bigger than meteoroids.

Comets storm)

  • a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit click below for NASA video 3:06 mins

Kuiper belt and oort cloud
Kuiper Belt and Oort Cloud storm)

  • The Kuiper Belt and the Oort Cloud surround our sun, a star.

  • The Kuiper Belt is a doughnut-shaped ring, extending just beyond the orbit of Neptune from about 30 to 55 AU.

  • The Oort Cloud is a spherical shell, occupying space at a distance between five thousand and 100 thousand AU.

  • The first mission to the Kuiper Belt is New Horizons spacecraft. New Horizons was launched in 2006 and will reach Pluto in 2015.

Click below for 4:40 min video

The planets

What else is out there
What else is out there? storm)

  • It seems unlikely that other planets in our Solar System support life.

  • SETI, the “Search for ExtraTerrestrial Intelligence” is an independent non-profit.

  • The mission of the SETI Institute is to explore, understand and explain the origin, nature and prevalence of life in the universe.