BQ3489 - Starry sky and the Milky Way across a moonlit landscape of eroded sandstone cliffs in Tassili National Park, in the heart of the Sahara desert in southern Algeria.

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JE5452 - This image shows a small section of the Veil Nebula, as it was observed by the Hubble Space Telescope. This section of the outer shell of the supernova remnant is in a region known as NGC 6960, also known as the Witch's Broom Nebula.

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SN3249 - Milky Way galaxy seen obliquely from above, with the arms and the central bar in their approximate known locations.

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BC6052 - Expansion of the universe from elementary particles to a macrocosmic universe.

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BN9956 - Total solar eclipse, Libya, March 29, 2006.

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BP6518 - Our solar system and points beyond.

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BY4606 - Over 400 years ago, Johannes Kepler witnessed the appearance of a new "star" in the sky. It is known as the Kepler supernova.

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BN6501 - On 22 July 2009 the longest total solar eclipse of the 21st century was photographed from the Pacific Ocean for over 6.5 minutes.

BS0465 - Hoodoos, the Milky Way, and a shooting star in Goblin Valley, Utah.

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P4013 - Any object with mass distorts space-time in its locality, a phenomenon we know as gravity.

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BQ3474 - In a star party by amateur astronomers, the young local people of Bhaktapur are gathered to see the Moon through a telescope for the first time. Star parties are an exciting event because there are very few telescopes in Nepal.

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SL3051 -  Wormholes are a possible solution to Einstein's equations that describe the properties of space-time, the continuum of unified space and time.

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SL8288 - A protoplanetary disc has formed around the star Beta Pictoris (upper center).

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SL9828 - Earth's magnetic field, computer artwork. The blue lines represent the magnetic field lines, which extend from the magnetic poles near the North and South poles.

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SM3333 - Colliding planets. This event is similar to that which saw the Moon formed when a small protoplanet collided with the early Earth.

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BM9163 -  An amateur astronomer looks through a telescope at the summer Milky Way in this composite photo.

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A full-disk multiwavelength extreme ultraviolet image of the sun taken by NASA's Solar Dynamics Observatory on March 30, 2010. False colors trace different gas temperatures. Reds are relatively cool (about 60,000 Kelvin, or 107,540 F); blues and greens are hotter (greater than 1 million Kelvin, or 1,799,540 F).

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BK9500 - The total phase of the lunar eclipse of August 28, 2007 is shown in this composite view made from three separate images taken at the start of totality, (right), mid-eclipse, and the end of totality, (left).

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