Astronomy Flashcards
True or false gravitational field strength ranges on different planets
True
What is earth’s gravitational field strength
10 N/kg
Weight formula
W = mg
Weight = mass x gravitational field strength
orbital speed formula
Orbital Speed = 2π(Orbital radius) / Orbital period
v = 2πr/T
planets have a … orbit
circular
comets have a … orbit
elliptical
why does a comet have an elliptical orbit
Comets are located in the Oort cloud and when another star passes by it is affected by the gravity and moves towards our sun. The comet gains speed as it gets closer to the sun so that it can stay on its path. The comet slows down again as it moves away from the sun creating an elliptical orbit
we are in what galaxy
Milky way galaxy
we are part of the … system
solar
what is a universe
a collection of billions of galaxies
what is a galaxy
a collection of billions of stars
what is a star
a burning ball of gas
what is in our solar system
mercury, venus, earth, mars, asteroid belt, jupiter, saturn, uranus, neptune, kuiper belt, oort cloud
What is a comet
an icy body that releases gases as it orbits the sun
what is an asteroid
a rocky body smaller than a planet that orbits the sun
