Credit & Copyright: Robert D. Loss,
WAISRC
Explanation:
The remnants of
nuclear reactors nearly two billion years old were
found in the 1970s in Africa.
These reactors are thought to have occurred naturally.
No natural reactors exist today, as the relative density of
fissionable
uranium has now decayed below that needed for a
sustainable reaction.
Pictured above is Fossil Reactor 15, located in Oklo,
Gabon.
Uranium oxide remains are visible as the yellowish rock.
Oklo by-products are being used today to
probe the stability of the
fundamental constants over cosmological
time-scales and to develop more effective means
for disposing of human-manufactured
nuclear waste.
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr' |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Publikacii s klyuchevymi slovami:
fundamental'nye postoyannye
Publikacii so slovami: fundamental'nye postoyannye | |
|
Sm. takzhe:
| |
