1. Home
  2. Education
  3. Space / Astronomy

On This Date in History - January 21

by Nick Greene
for About.com

Neptune - Visual Solar System Tour

Neptune - Visual Solar System Tour - Neptune

NASA/JPL

Daily Extra :

Astronomy & Space Word of The Day

geologic time: The time extending from the end of the formative period of the Earth to the beginning of human history.

Who Was Born Today?:

1908: Bengt Stromgren, Goteborg Sweden, astrophysicist, studied gas cloud
1930: Valentin Ignatyevich Filatyev, Russia, cosmonaut
1950: Joseph R Tanner, Danville, Illinois, astronaut, STS 66, 82, sk: 97

Who Died Today?:

Today in History:

1951: Westinghouse J-40 jet engine (7,500 pounds dry thrust) completed 150-hour Navy qualification test.

1979: Neptune becomes outermost planet (Pluto moves closer). Unless a new planet is discovered, Neptune will remain outermost planet since on August 24, 2006, the International Astronomical Union (IAU) formally downgraded Pluto from an official planet to a dwarf planet. (See Is Pluto a Planet.)

Featured Astronomy Image of the Week

Check out the former Astronomy Picture of the Day. See what surprises await you this week.

Explore Space / Astronomy

About.com Special Features

A Smarter Future

Tips that will help finance your education, excel in the classroom, and advance your career. More >

How to Ace the GRE

Being well prepared is the first step; here are more essential suggestions. More >

  1. Home
  2. Education
  3. Space / Astronomy
  4. Events & Calendars
  5. Calendars of Events
  6. This Date In History
  7. On This Date in History - January 21>

©2009 About.com, a part of The New York Times Company.

All rights reserved.