A rainbow isn't a flat 2-dimensional image on the dome of sky. It's more like a mosaic, composed of many separate bits ... in 3 dimensions. Visit this post for many beautiful rainbow images.
How do astronomers determine masses for distant space objects? Here's one example - using the moon's orbit as a baseline to find the mass of our sun - from EarthSky's Bruce McClure.
Long ago, the Coma star cluster represented the Lion's tufted tail. Today, we know it as an open star cluster, whose stars were born together and are still loosely bound by gravity.
Zhean Peter Nacionales in the Philippines captured this view of the Coma star cluster. He wrote, “I learned at the EarthSky page to star-hop from Leo to the Coma star cluster, so I packed up my camera and tripod. It was worth it.”
To make whoopee can mean: to engage in uproarious merrymaking. Linda Holtby used the phrase while posting this shot to EarthSky Facebook. She said she caught the shot from 38,900 feet (11,860 meters) up.
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