Author Question: State Kepler's three laws of planetary motion. What will be an ideal ... (Read 101 times)

dbose · **on:** Jul 27, 2018

State Kepler's three laws of planetary motion.

What will be an ideal response?

Question 2

Which of the following describes a major danger of interstellar travel at near light speed?

A) Any interstellar journey will take much longer than the lives of the crew members.
B) Time dilation will slow the heartbeats of the crew to a dangerously low rate.
C) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays.
D) Asteroid fields floating in interstellar space will present a navigational challenge.
E) Supernova explosions will destroy spaceships passing nearby.

dantucker · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

1. The orbit of each planet is an ellipse with the Sun at one focus.
2. As a planet moves around its orbit, it sweeps out equal areas in equal times.
3. A planet's period squared is equal to its semimajor axis cubed.

Answer to Question 2

C