Solar System Ap Hd

​Discover Science: Geocentric vs. Heliocentric

Geocentric means that everything revolves around the Earth. Heliocentric means that everything in the solar system revolves around the Sun. We found out that everything revolves around the Sun because in the early sixteen hundreds the telescope was invented.

Multiple Choice

Geocentric means what

• The Moon is the center of the universe.
• The Sun is the center of the universe.
• The Earth is the center of the universe.

Multiple Choice

Heliocentric means what

• The Earth and planets revolve around the Sun

• The Earth is the center of the universe

• The Moon is the center of the solar system

• The Sun revolves around the Earth

​What Is The Solar System

In older times there were only five planets Mercury, Venus Mars, Saturn, and Jupiter. The Solar System is part of the Milky Way. Our Solar System has the Sun, Planets, Dwarf Planets, Moons, Asteroids, Comets, and Meteoroids.

Multiple Choice

What are the five planets that older people new of

• Mercury, Venus, Mars, Saturn, and Jupiter.

• Mercury, Venus, Sun, Earth, and Neptune

• Earth. Moon, Venus, Pluto, and Uranus

• Saturn, Earth, Pluto, Mars, and Mercury,

• Pluto, Jupiter, Venus, Neptune, and Earth

Multiple Choice

Our Solar System is part of which galaxy

• Andromeda

• Triangulum
• Orion
• Milky Way

The Sun

The Suns gravitational pull holds the planets and other things in orbit. The Sun is a star, a star is an extremely hot dense mass of gases. The light and heat that we get comes from the Sun.Our Sun is a medium sized star.

Multiple Choice

The Suns gravitational pull holds what in orbit

• Planets
• Stars
• The Milky Way Galaxy

• Asteroids

Multiple Choice

Whats a Star

• A star is a type of car
• A star is a type of candy
• A star is a extremely hot dense ball of gases

• A star is a big planet

Planets

Within our Solar System there are 8 major planets. The planets closer to the Sun are small and rocky. The planets farthest to the Sun are gas giants.

Multiple Choice

The closest planets are

• Small and rocky

• Gas giants

The Inner Planets

Mercury is the closest planet to the Sun. Venus is the second closest planet to the Sun. Earth is the third closest planet to the Sun. Mars is the fourth closest to the Sun. It takes Mercury 88 days to do one orbit around the Sun. Venus spins so slowly that it orbits around the Sun bfore it does one day cycle. There are 4 inner planets

Multiple Choice

How long does it take to travel one year on Mercury

• 72 days

• 666 days

• 21 days

• 88 days

Multiple Choice

How many inner planets are there

• 4

• 3

• 5

• 6

The Outer Planets

Jupiter, Saturn, Uranus, and Neptune are the outer planets. They all have freezing temperatures, many moons, and ring systems. Jupiter is the largest planet. Saturn has the largest ring system. Neptune is named after the Roman God of the sea.

Multiple Choice

Whats the biggest planet

• Jupiter
• Venus
• Mars
• Mercury

Multiple Choice

All the Outer Planets have rings

• True

• False

​Planets to scale

The Gas Giants are the biggest planets. The planets from biggest to smallest are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury.

Multiple Choice

What are the 4 biggest planets in order

• Mars, Jupiter, Saturn, Uranus
• Venus, Earth, Mars, Jupiter
• Saturn, Jupiter, Neptune, Uranus
• Jupiter, Saturn, Uranus, Neptune

Multiple Choice

What are the 4 smallest planets

• Jupiter, Saturn, Uranus, Neptune
• Pluto, Jupiter, Saturn, Uranus
• Mars, Jupiter, Saturn, Uranus
• Mercury, Mars, Venus, Earth

​Pluto is No Longer A Major Planet

A planet must have The object is in orbit around the Sun, The object has a nearly spherical shape, and The object has cleared the neighborhood around its orbit of smaller objects. Pluto didn't meet the third criteria due to the large number of other frozen worlds that share its orbit. Since 2006 Pluto is considered a Dwarf Planet. Pluto is part of the Kuiper belt.

Multiple Choice

What was Pluto classified as before 2006

• Ninth planet
• Comet
• Dwarf star
• Asteroid

Multiple Choice

What is the third rule for being classified as a planet

• Must have a perfectly spherical shape
• Must have cleared the neighborhood around its orbit of smaller objects

• Must be located in the asteroid belt
• Must have at least one moon

​Moons

About 180 moons orbit the planets in our Solar System. Moons are smaller than the planet they orbit and are held in place by the pull of gravity from the planet its orbiting. Gas giants attract more moons, and bigger moons.

Multiple Choice

There are about _____ moons

• 500
• 100
• 180

• 250

Multiple Choice

What do moons orbit

• Planets
• Comets
• Asteroids
• Stars

​Smaller Bodies

Asteroids are rocky objects that orbit the Sun. When a Asteroid is hit out of orbit it becomes a meteoroid and could be a potential threat to planets, moons, spacecrafts, and satellites. A comet is a small mass of dust and ice that originates in an area beyond Pluto called the Oort cloud. A coma is a trail of dust and gas that travels behind a comet.

Multiple Choice

When a Asteroid is hit it turns into a

• meteoroid
• star
• planet
• comet

Multiple Choice

Whats a coma

• A coma is a comets trail

• A coma is a type of punctuation mark used in writing

• A coma is a moon

• A coma is a planet