Contributor Guidelines

Blast off!

Explore the wonders of the universe from the comforts of your own home with Space & Beyond Box.

SUBSCRIBE
RENEW
DIGITAL EDITIONS
GIVE A GIFT

Customer Service

Tonight's Sky

Sun

RISE—

SET—

Sun

Moon

—

PHASE—

DISK—

Mercury

RISE—

SET—

Mercury

—

Venus

—

Venus

—

Mars

RISE—

SET—

Mars

—

Jupiter

—

Jupiter

—

Saturn

—

Saturn

—

Tonight's Sky — Change location

City/place name

US state, Canadian province, or country

OR

US ZIP code

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

Latitude: ° '

Longitude: ° '

UTC Offset:

Home
/
Our Magazine
/
About the Magazine
/
Contributor Guidelines

FREE EMAIL NEWSLETTER

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

Facebook
Twitter
Google+

THE MAGAZINE

Table of Contents
Subscribe
Digital Editons

Dark matter accounts for approximately 80% of the mass of the universe, but what exactly is it?

Find us on Facebook

Astronomy Magazine

Tonight's Sky — Change location

OR

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

ABOUT THE MAGAZINE

SUBSCRIBER EXTRAS

IN EVERY ISSUE

COLUMNISTS

FEATURES

RECENT HEADLINES

TOPICS

RECENT HEADLINES

TOPICS

PICTURE OF THE DAY

RECENT GALLERIES

TOPICS

RECENT HEADLINES

TOPICS

RECENT POSTS

TOPICS

READER GALLERIES

TOPICS

NEW PRODUCTS

IN OUR STORE

CURRENT ISSUE

Contributor Guidelines

SEARCH RESULTS BY CATEGORY

FREE EMAIL NEWSLETTER

THE MAGAZINE