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Mercury Venus Earth Mars

The 4 terrestrial planets, in order of distance from the Sun, are shown in scale. Earth's Moon would look to be about 3/4 of the size of Mercury.

Atlantis from International Space Station

The Way Home

Backdropped by a cloud-covered part of Earth, Space Shuttle Atlantis was photographed by the Expedition 15 crew after it undocked from the International Space Station on June 19, 2007, in preparation for the journey home. The STS-117 astronauts completed about eight days of joint operations with the station crew. The docked Soyuz spacecraft is visible at left.

Image credit: NASA
Source: NASA Image of the Day Gallery

Spitzer Space Telescope

(1024x768 Wallpaper of conception of Spitzer in space)

The 0.85-meter infrered facility was luanched on 25 August, 2003 to probe deeper into the dimmer, cooler and denser regions otherwise not observable in the optical range. Spitzer is the last of the NASA Great Observatories .

Source: Images from Spitzer

Galaxy NGC 2207 and IC 2163 to merge in 1 billion years

Check Wikipedia's quickie explanation on NGC 2207 and IC 2163

Source: HubbleSite and it's Greatest Hits