Suppose the room in which you are sitting was magically transported off Earth, and sent accelerating through the universe at 9.8 m/s2 Assuming your doors and windows are sealed and closed, how could you tell that you'd left Earth?
A) You would weigh more than you do on Earth.
B) You couldn'tthe equivalence principle tells us that you won't be able to tell the difference.
C) Your time would run slower than it does on Earth.
D) You'd hear a loud whooshing sound as you careened through space.
Question 2
Why is the possible contamination of the Earth by Martian microbes in a future sample return mission not considered to be a significant problem?
A) Martian microbes will certainly be destroyed by terrestrial microbes
B) any Martian microbes will be destroyed by high-energy particles and radiation on their trip back to Earth
C) Martian microbes will be rapidly destroyed by oxygen in the Earth's atmosphere
D) Martian microbes are likely to be quite different than terrestrial microbes and, hence, will probably not be able to affect life on Earth
From space earth shows itself as a planet covered mostly by water.
Mars oppositions from 2003-2018, viewed from above the ecliptic with the Earth centered
Earth’s Spheres
Wall Painting In The "Ixion Room," House of the Vettii
The Oceans of Earth
The Last Man on Earth