Goals of chapter 1
Develop our perspective about astro
Where are we?
Be an active questioner
How we learned earth is a planet?
Where is earth?
Earth is member of the solar system
Earth is not the centre of the solar system or universe
It was believed that earth was centre from Greek astronomy 2200 years ago until 1500
Earth is insignificant
How have we learned the correct view?
Whats is the solar system?
Solar system= the sun and all the objects that belong to the sun a large family
Formed billions of years ago
How do we know when it was formed?
There are many other solar systems, far beyond
How do we know
We can't visit any other systems because they are too far
How can we know what they are like?
Members of the solar system
Sun= heart of the solar system but it is just a star, like billions of others
Planets, like earth, mars, jupiter…
Dwarf planets, like pluto, eris
natural satellite (moons) orbiting planets
minor planets= asteroids, there are thousands
meteoroids= rocks made up of ice, dust
how big is the solar system
big does not have enough information
don't memorize the numbers, will never ask just find out how we know and meaning
understand what would be different if the number were different (mass of jupiter meaning
leads us to)
how big is dart
earths raiuds= 6,378 km