The question was «What is the mass of planet Earth?»
In the science section of howstuffworks.com the answer is this:
«The quick answer to that is approximately 6,000,000, 000,000,000,000,000,000 (6 x 1024) kilograms.
The interesting sub-question is, “How did anyone figure that out?” It’s not like the planet steps onto the scale each morning before it takes a shower. The measurement of the planet’s weight is derived from the gravitational attraction that the Earth has for objects near it.»
I shot a few versions of this photo before I was satisfied. I ended up with this overexposed version, which I think highlights the important objects that makes the photo and leaves out the rest (the background was just creating noise and unwanted attention in this image). The theme for the Weekly Photo Challenge this week is Future Tense and I think this photo suits the challenge:
«In today’s challenge we want you to grab an image from your world that holds the promise or portent of the future.»