The view of Earth from space is amazing, but even better is a picture of Earth out of people’s selfies. NASA put together a collection of 36,000 tiny photos, all taken on Earth Day 2014, with each photo pasted on the spot where it was taken. People had either blue sky or white clouds above their heads, or dusty desert or green grass behind them, so each photo gives that place the right color! And since everyone took the photos during daylight, Earth gets to look sunny everywhere at once.
Lace up: If all the photos are green, blue, white or brown, how many background colors does the giant selfie have?
Jog: If you take your picture of yourself at 1:00 pm, and your friend takes a selfie 2 hours later, at what time does your friend take a selfie?
Sprint: It can take a lot of pictures to get the perfect selfie! You take 76 selfies, your teacher takes 53, and your principal takes 67 selfies. Put those numbers in order from least to greatest!
Hurdle: The U.S. is about 3,000 miles wide, and has about 30 photos stretching across it. About how many miles of real land does each photo cover?
High Jump: Earth is about 25,000 miles around at the equator. If each photo covers 100 miles, how many photos were needed to wrap around Earth?
Answers:
Lace up: 4 colors.
Jog: 3:00 pm.
Sprint: From least to greatest: 53, 67, 76 selfies!
Hurdle: About 100 miles.
High Jump: 250 photos.
