Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

Bob Berman's strange universe: No green stars for Johnny

August 2007: If our Sun doesn't look green even though it peaks at green, you can be sure no other stars can look green either.
What did we do with all our free time the past 200,000 years? By day, we mostly stared at the furry clothes we'd tossed on the cave floor and thought about cleaning them up someday. At night, we watched the stars. We noticed only two of their properties: brightness and color. Brightness differences were obvious, and the color business should have been just as clear cut. It wasn't, and still isn't.

Already a subscriber? Register now!

Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below.
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...