Kepler Himself
Which astronomer's data did Kepler use to develop his laws?
Who is Tycho Brahe?
What shape are planetary orbits?
What are ellipses?
According to the Second Law, planets sweep out equal _____ in equal time.
What are areas?
Which planet moves faster: Earth or Neptune?
What is Earth?
What is the equation for Kepler's 3rd Law?
What is T2 = a3?
What century did Kepler live in?
What is the early 1600s
How many focal points does an ellipse have?
What is two?
When does a planet move faster: near the Sun or far from the Sun?
What is near the Sun?
What happens to orbital speed when the distance increases?
What is it decreases?
In the equation T2 = a3, what does "T" represent?
What is the orbital period (years)?
What was Kepler trying to understand when he created his laws?
What is how planets move around the Sun?
Where is the Sun located in a planet's elliptical orbit?
What is at one focus?
When a planet is far from the Sun, it moves __________________________________________________?
What is slower?
Which law explains why planets change speeds during orbit?
What is Kepler's Second Law?
What does "a" represent in the equation?
What is distance from the Sun in AU?
True or False: Kepler used telescopes to make his observations?
What is False?
Name the point in an orbit where aplanet is closest to the sun.
What is perihelion?
What geometric shape is used to show "areas swept out"?
What are the triangles/wedges?
True or False: Planets move at constant speed.
What is False?
If aplanet is 1 AU from the Sun, what is its period?
What is 1 year?
Kepler discovered how planets move. Who later explained why?
Who is Isaac Newton?
Name the orbital point where a planet is farthest from the Sun.
What is the aphelion?
Why does a planet move faster near the Sun?
What is stronger gravitational pull?
What keeps planets in their orbit around the Sun?
What is gravity?
If a planet is 4 AU away, what is its period?
(Use T2 = 43 = 64
What is 8 years?