This animated interactive explains how a research group is using light to measure the speed of objects millions of miles away. Light that is farther away will appear to be a different color than a light that is closer. So by measuring the rate of color shifts, they can estimate velocity.
Light from the center of the galaxy
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Who Takes Care of the Kids, By Household Income
Higher income usually means more childcare, and lower income usually means less.
Differences Between Women and Men’s Everyday with Kids
The day-to-day changes a lot when you have kids. However, it seems to change more for women than it does for men.
Goodbye, Mid-Range Shot
There’s a space on the basketball court called “mid-range.” It’s actually not off-limits. In fact, people used to shoot these so-called “mid-range” shots.