** International Mother Earth Day ( International )

** Episode 2: The Earth Explodes ( 1991 )

** Three Books of Known Space ( 1996 reprint of Tales of Known Space, with " Madness Has Its Place " in place of " The Borderland of Sol ", packed with World of Ptavvs and A Gift from Earth )

** The Green Hills of Earth ( 1947 ).

** Empire Earth: the last mission of the German campaign is to carry out Operation Sea Lion

** The Earth Will Shake ( 1982 )

** Cosmic Trigger II: Down to Earth ( 1992 )

** Ground track, the path on the surface of the Earth directly below an aircraft or satellite

** Department of Earth Sciences

** Bertrand Piccard and Brian Jones become the first to circumnavigate the Earth in a hot air balloon.

** The Super Dimension Fortress Macross ( 1982 – 1983 ): A huge spaceship appears high above Earth and crashes into an island in the Pacific, triggering a world war.

** The Comet Hale-Bopp makes its closest approach to Earth.

** Patricia Neal, American actress ( The Day The Earth Stood Still ) ( d. 2010 )

** Apollo program: Apollo 10 returns to Earth, after a successful 8-day test of all the components needed for the upcoming first manned Moon landing.

** Project Diana bounces radar waves off the Moon, measuring the exact distance between the Earth and the Moon, and proving that communication is possible between Earth and outer space, effectively opening the space age.

** Earth Day 20 is celebrated by millions worldwide.

** Vostok 1: Soviet cosmonaut Yuri Gagarin becomes the first human in space, orbiting the Earth once.

** Jacques Piccard and Don Walsh descend into the Mariana Trench in the bathyscaphe Trieste, reaching the depth of 10, 911 meters ( 35, 797 feet ) and become the first human beings to reach the lowest spot on Earth.

** Luna 20 comes back to Earth with 55 grams ( 1. 94 oz ) of lunar soil.

** The first Earth Day proclamation is issued by San Francisco Mayor Joseph Alioto.

** The USSR's Venera 7 becomes the first spacecraft to land successfully on Venus and transmit data back to Earth.

** Apollo program: Apollo 14 returns to Earth after the third manned Moon landing.

** Gemini 6 and Gemini 7 perform the first controlled rendezvous in Earth orbit.

** Asteroid 4581 Asclepius approaches the Earth at a distance of 700, 000 kilometers.

** Internet Explorer since 2001

** Lawrence Edward Grace Oates, English Explorer ( b. 1880 )

** Explorer program: The United States launches Explorer 6 from the Atlantic Missile Range in Cape Canaveral, Florida.

** Explorer program: Explorer 32 is launched.

** NASA's Explorer 1, the first American satellite and Explorer program spacecraft, reenters Earth's atmosphere after 12 years in orbit.

** Alex Alexander, Spanish Explorer

** ACE ( Advanced Composition Explorer )

** Interstellar Boundary Explorer

** Jane M. Konczacki, Victorian Explorer, ( 1997 ), Nimbus Publishing ( ISBN 1-55109-103-8 ).

** Explorer K-8

** Windows Live Web Messenger was a web-based program for use through Internet Explorer

** Announcement of the availability of Windows XP Beta 2, which includes the first public beta of Internet Explorer 6.

** Windows 7 introduced jumplists which are menus that provide shortcuts to recently opened documents, frequently opened documents, folders paths ( in case of Windows Explorer ), or various options ( called Tasks ) which apply to that specific program or pinned website shortcut.

** Google Chrome Frame, an Internet Explorer plug-in based on Chromium

** Deubox Explorer ( formerly known as Dudebox Explorer ) by Red Chair Software ( homepage ) is a transfer program for Microsoft Windows.

** Internet Explorer 8: Microsoft has limited its support to certain " non-navigable " content for security reasons, including concerns that JavaScript embedded in a data URI may not be interpretable by script filters such as those used by web-based email clients.

** Internet Explorer 9: Internet Explorer 9 does not have 32KB limitation and allowed in broader elements.

** Wide-field Infrared Survey Explorer was launched in December 2009 to begin a survey of 99 % of the sky at wavelengths of 3. 3, 4. 7, 12, and 23 μm.

** Internet Explorer 5. 5 was released