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

° '
° '

Why does the zodiacal dust cloud still exist after billions of years? Does something replenish it?

Art Humphrey, Oro Valley, Arizona
RELATED TOPICS: SOLAR SYSTEM | ZODIACAL LIGHT
Triangular-glow
Astronomers have known about the zodiacal dust cloud for more than 300 years, since Giovanni Domenico Cassini drew attention to the phenomenon of the zodiacal light and gave the correct explanation for it as sunlight reflected from small grains of dust. Early space missions began studying the distribution of this dust in the 1960s. In 1983, the Infrared Astronomical Satellite detected infrared emission from the zodiacal dust.

Astronomy magazine subscribers can read the full answer for free. Just make sure you're registered with the website.

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...