Motion in the universe Flashcards
What is a universe?
A large collection of billions of galaxies
What is a galaxy?
A large collection of billions of stars
What do planets orbit?
The sun
What do comets orbit?
The sun
What do asteroids orbit?
The sun
Why do objects orbit?
Because it is the result of gravitational force of attraction acting between 2 bodies
What are the similarities in the way different planets orbit the sun?
-Their orbits are all circular with the sun as the focus
-They all orbit in the same plane
-They all travel in the same direction around the sun
What are the differences in the way different planets orbit the sun?
-They orbit at different distances from the sun
-They orbit at different speeds
-They all take different times to orbit around the sun
What does the orbit of a comet look like?
-it looks like an oval
What happens as the moon orbits closer to the planet?
-The shorter the time it will take to complete each orbit
-The greater the speed of the orbit
What happens as a comet approaches the sun?
Their speed increases
