Is there a planet B?
(Phenomenon 4)
If humans are causing so much change to the Earth and we have started a new era, is there another place to go to start over? Is there a planet B?
Planets in our Solar system size comparison. Largest to smallest are pictured left to right, top to bottom: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury. Via Wikimedia Commons.
NECESSARY VOCABULARY:
LIGHT-YEAR
- A unit of length equal to the distance light travels through space 1 Earth year (365 days).
- 9.4607 × 10^12 km (nearly 6 trillion miles)
MASS
-Amount of stuff
-Number of molecules* mass of each molecules
ROTATION
- the spinning motion of a boy on its axis.
- Earth spins on it's axis. One complete rotation equals one Earth day (24 hours).
REVOLUTION
-the elliptical motion of a body as it orbits another body in space
- Earth revolves around the sun. One complete revolution equals one Earth year (364.25 days).
WEIGHT
- Force exerted on an object due to gravity
LIGHT-YEAR
- A unit of length equal to the distance light travels through space 1 Earth year (365 days).
- 9.4607 × 10^12 km (nearly 6 trillion miles)
MASS
-Amount of stuff
-Number of molecules* mass of each molecules
ROTATION
- the spinning motion of a boy on its axis.
- Earth spins on it's axis. One complete rotation equals one Earth day (24 hours).
REVOLUTION
-the elliptical motion of a body as it orbits another body in space
- Earth revolves around the sun. One complete revolution equals one Earth year (364.25 days).
WEIGHT
- Force exerted on an object due to gravity