Universe


The universe is defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them



The universe is very large and possibly infinite in volume. The observable matter is spread throughout the universe. On small length-scales, matter is observed to form "clumps", superclusters and, the largest-scale structures such as the Great Wall of galaxies.


The universe is old and evolving. The most precise estimate of the universe's age is 13.73±0.12 billion years old, based on observations of the cosmic microwave background radiation. Many models of the cosmos (cosmologies) and its origin (cosmogonies) have been proposed, based on the then-available data and conceptions of the universe. Most modern, accepted theories of cosmology are based on general relativity and, more specifically, the predicted Big Bang; however, still more careful measurements are required to determine which theory is correct



Milky Way Center

Nature-Milky Way Center

Stunning image of the heart of the Milky Way, our galaxy, our home in the universe

Milky Way Center Wallpaper

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Oldest clocks of the universe

Nature-Oldest clocks of the universe

Thousands of stars in blue harmony, one of the best images by the NASA

Oldest clocks of the universe Wallpaper

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M81 Galaxy Wallpaper

Nature-Universe

The huge M81 is one of the most striking examples of a grand design spiral galaxy

M81 Galaxy Wallpaper Wallpaper

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Alien Sunset Wallpaper

Nature-Universe

NASA created this spectacular image of an alien sunset with two setting suns

Alien Sunset Wallpaper

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Apollo 15 flag at Moon

Nature-Apollo 15 flag at Moon

NASA created this spectacular image of an alien sunset with two setting suns

Apollo 15 flag at Moon Wallpaper

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Mars Sunset

Nature-Mars Sunset

Real image of a martian sunset, caught by NASA's Mars Exploration Rover Spirit

Mars Sunset Wallpaper

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All pillars point to Eta

Nature-All pillars point to Eta

Millions of stars form this spectacular false-color image by NASA's Spitzer Telescope

All pillars point to Eta Wallpaper

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Solar System Wallpaper

Nature-Solar System Wallpaper

Millions of stars form this spectacular false-color image by NASA's Spitzer Telescope

Solar System Wallpaper

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Spitzer Wallpaper

Nature-Spitzer Wallpaper

Launch of NASA Spitzer Space Telescope, a space-based infrared observatory

Spitzer Wallpaper

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Star Cluster Wallpaper

Nature-Star Cluster Wallpaper

Truly amazing colors in this large group of very distant stars

Star Cluster Wallpaper

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Sun Magnetic Fields Wallpaper

Nature-Sun Magnetic Fields Wallpaper

The differential rotation of the Sun's latitudes causes its magnetic field lines to become twisted together

Sun Magnetic Fields Wallpaper

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