quasar:

Also called QSO, Quasi-Stellar Object. One of a number of distant celestial objects larger than stars but smaller than galaxies. Quasars give off blue light and powerful radio waves. Even though quasars seem to be much smaller than galaxies, they give off thousands of times more energy. Some scientists think…

Explore Science Dictionary

Seymour Science Blog

Earth Day eBook SaleWednesday April 11, 2018

Earth Day eBook Sale

I am so pleased that HarperCollins is doing a special promotion with two of my books for Earth Day. Between now and April 23, the eBook editions of two of my books, GLOBAL WARMING and WILDFIRES, will be on sale for just 99¢…

READ MORE
Seymour Simon on Facebook and Twitter Become a Seymour Simon Facebook Fan Follow Seymour's field notes and photos