Astronomical Unit ( AU )
AU is the average distance between the Earth and the Sun. Its value is 150 million kilometers or 93 million miles or 1 AU.
2.54 Million Light-years (Mly)Milky Way
Galaxy
AndromedaGalaxy
SPEED OF LIGHT: 299,792,458 meters per secondor186,000 miles per second
http://www.nasa.gov/mission_pages/hubble/science/milky-way-collide.html
The distance to the Andromeda Galaxy is 2.54 million light-yearshttp://www.universetoday.com/30716/distance-to-andromeda/#ixzz2sRagJdDS
Distance on Earth is measured in KILOMETERS(km) and MILES (mi).
Distance in the solar system is measured in ASTRONOMICAL UNITS (AU).
Distance in the Milky Way galaxy measured in LIGHTYEARS (ly).
Orbital Velocity
http://www.youtube.com/watch?v=gvSUPFZp7Yo
is how fast a planet travels as it orbits around the Sun.
Copy and answer the following questions.1.What is Kepler’s 1st Law?2. Kepler’s 2nd Law states that
planets sweep equal _______ in equal amount of _________.
3. What is the equation for Kepler’s 3rd Law?
4.What is Kepler’s 3rd Law?
Kepler’s 2nd Law states that planets sweep equal _______ in equal amount of __________.
AreasTime
The area of thisIs equal to the area of this
They just have different shapes.
P is the orbital velocity (amount of time for a complete revolution.)
What is the equation for Kepler’s 3rd Law?
P2 = a3
a is the Astronomical Unit (AU).
Orbital Velocity
http://www.youtube.com/watch?v=gvSUPFZp7Yo
is how fast a planet travels as it orbits around a star.
Kepler’s 3rd Law compares the orbital velocities of planets. Planets near the Sun revolve faster while planets farther from the Sun revolves slower.
28 mi/secNearest to the Sun.
21 mi/sec18 mi/sec
15 mi/sec
8 mi/sec6 mi/sec4 mi/sec
3 mi/secFarthest from the Sun
5. Kepler’s 3rd Law can determine the _____________of a planet given its distance from the Sun.
a.orbital velocity or orbital periodb.length of a yearc.length of a dayd.degree of ellipse of the orbit
orbital velocity