Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Web Extras

Mercury in the cross hairs

NASA’s ambitious MESSENGER spacecraft will have company by the end of this decade, when the BepiColombo mission reaches the innermost planet.
By Richard Talcott
Published: February 21, 2011
Planetary scientists can’t seem to get enough of Mercury. The world closest to the Sun didn’t receive any spacecraft visits for 33 years — from the third and final flyby executed by NASA’s Mariner 10 probe in 1975 — until the first MESSENGER flyby in 2008. After two subsequent flybys, MESSENGER became the first craft to orbit Mercury in March 2011.
Subscriber-Only Content Subscriber Only Access
You are currently not logged in. This article is only available to Astronomy magazine subscribers.
Already a subscriber to Astronomy magazine?
If you are already a subscriber to Astronomy magazine you must log into your account to view this article. If you do not have an account you will need to regsiter for one. Registration is FREE and only takes a couple minutes.
Login   Register
Non-subscribers, Subscribe TODAY and save!
Subscribe
Get instant access to subscriber content on Astronomy.com!
  • Access our interactive Atlas of the Stars
  • Get full access to StarDome PLUS
  • Columnist articles
  • Search and view our equipment review archive
  • Receive full access to our Ask Astro answers
  • BONUS web extras not included in the magazine
  • Much more!
SEARCH SITE
Subscriber Only Access
Subscriber Only Content
Look for this icon. This denotes premium subscriber content. Learn more »
Become a Member of Astronomy.com
Register today for access to more valuable resource information.
Interact in our forums, comment on articles, receive our newsletter and much more!
Not a member?
Subscriber and Member Login
Password
Remember me