SOLAR SYSTEM

• Solar System- A system that revolves around the sun
• System- Composed of different parts working together as a whole
• the Sun is a STAR (medium sized)
• Galaxy- A group of stars and planets all together (We live in the milky way galaxy)
• Oort Cloud- A cloud of ice and dust at the edge of our solar system
• Asteroid Belt- The space between Mars and Jupiter where there are many asteroids
• Kuiper Belt- An area beyond Neptune's orbit with small, rocky objects called Kuiper Belts Objects(KBOs) which include Pluto.
• stars- always have their own light, self luminous, very big, colorful
• STAR COLORS: yellow- sun, red- giants, blue- Hottest, white
• Sun- enables as to have light in the day
• Moon- enables us to have light in the night, not self-luminous, reflects sunlight, 1/4 of its surface is covered by oceans, 1/3 of its surface is covered by mountains, 1/3 of its surface is covered by craters
• Planet- A celestial body that orbits around the Sun, has enough gravity to pull itself into a spherical shape, can be seen without using telescopes, does not emit it's own light but reflect light from other sources
• Venus- Second closest planet to the sun, second largest planet, thick clouds made up of sulfuric acid, hotter than mercury, no water on the surface, no moons
• Mercury- Closest planet to the sun, smallest planet, no atmosphere, volcanic activity, no moons
• Gravity- makes it possible to have a solar system
• The Earth has 365 and 1/4 days to revolve around the sun= 1 year travelling around the sun
• Day- Rotation
• Year- Revolution (you go around something)
• orbit- is not a perfect circle its an ellipse or an oval
• Order of closest to the sun- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• comet- a ball of dust and gas that orbits the sun and is visible in the night sky
• Halley's comet- 1705, 1986,
• Atmosphere- makes the asteroid disintegrate
• A shooting star is NOT A STAR, it does not have its own light, its just a meteor that burns up when it enters the atmosphere
• Planetesimal- a large solid object formed from the gravitational collapse of a protoplanetary disk. CAME FROM SOLAR NEBULA
• SOLAR NEBULA- The cloud of dust and gas that surrounds the sun
• Planetesimal - planets - asteroids
• Light Year- The distance light travels in a year.
• The brightest star in the sky other than the sun is Sirius
• The largest object in the solar system is the star
• Force of attraction between the earth and the moon is GRAVITY
• The moons gravity is 1/6 that of the Earths
• Comet is made of a dense core of dust and gas surrounded by a thin layer of ice and a tail of dust and gas (water and ice)
• change of seasons is caused by the earths tilt on its axis and the earths orbit around the sun
• heliocentric- the earth orbits the sun, not the other way around
• Geocentric- The Earth is the center of the universe and everything revolves around it.
• comet- a ball of dust and gas that orbits the sun and is visible in the night sky (frozen)
• meteor- a small piece of rock or metal that is thrown into space by a collision with another object
• asteroid- a large rocky body orbiting the sun that is not a planet
• Astronauts weigh more on Earth than they do on the Moon because the moon has less gravity on the earth