Space (U)

In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe ...

U.S. Flag on Moon (Apollo 11)

U.S. Flag on Moon (Apollo 11)

1600x1200, 541K

USA Spacecraft Space Shuttle Rocket

USA Spacecraft Space Shuttle Rocket

1024x768, 152K

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