Apollo 1, Challenger, Columbia

I consider anyone a hero if they're willing to ride a column of flame into space. This week we mark the anniversaries of losing some heroes in the line of duty:

Apollo 1, January 27, 1967
--Command Pilot Virgil "Gus" Grissom
--Senior Pilot Edward H. White
--Pilot Roger B. Chaffee

Shuttle Challenger, STS-51L, January 28, 1986
--Commander Francis R. Scobee
--Pilot Michael J. Smith
--Mission Specialists
----Ellison S. Onizuka
----Judith A. Resnik
----Ronald E. McNair
--Payload Specialists
----Gregory B.Jarvis
----S. Christa McAuliffe (Teacher in Space)

Shuttle Columbia, STS-107, February 1, 2003
--Commander Rick D. Husband
--Pilot William C. McCool
--Mission Specialists
----David M. Brown
----Kalpana Chawla (Flight Engineer)
----Laurel B. Clark
--Payload Commander Michael P. Anderson
--Payload Specialist Ilan Ramon

Best way I can think to honor their memory is to put up this NASA Astronomy Pic of the Day, Atlantis (STS-30) taking the Magellan Venus probe into orbit (click on it to enlarge, or follow the link).