Neptune, the eight planet of the solar system completed its first orbit around the sun on Tuesday, 165 years after its discovery.

Neptune, which is also the farthest planet from sun, was discovered by German astronomer Johann Galle on September 23, 1846.

Thirty times farther than Earth, the blue-green planet named after Roman God of Sea completes one revolution approximately every 165 years and July 12, 2011 was its first recorded anniversary, NASA said in a statement.

Commemorating the event, NASA has released the latest pictures of Neptune captured by Hubble telescope.

The pictures have revealed that Neptune, which experiences seasons just as Earth does, is currently having early summer in the southern hemisphere and winter in the northern hemisphere.

Check out the pictures below as we have put across some interesting facts about Neptune (Courtesy: NASA):

Neptune Fact # 1: Neptune experiences seasons just as Earth does, because it is tilted 29 degrees, similar to Earth's 23-degree-tilt.

Neptune Fact # 2: Instead of lasting a few months, each of Neptune's seasons continues for about 40 years.

Neptune Fact # 3: In December 1612, while observing Jupiter and its moons with his handmade telescope, astronomer Galileo Galilei recorded Neptune in his notebook, but as a star. More than a month later, in January 1613, he noted that the star appeared to have moved relative to other stars. But Galileo never identified Neptune as a planet, and apparently did not follow up those observations, so he failed to be credited with the discovery.

Neptune Fact # 4: Neptune can be seen using a telescope in the constellation Aquarius, close to the boundary with Capricorn.

Neptune Fact # 5: About 30 moons are known to orbit Neptune, most of which are too faint or orbit too far away.

Neptune Completes First Revolution Since Discovery
The Hubble images, taken with the Wide Field Camera 3 on June 25-26, 2011, reveal high-altitude clouds in the northern and southern hemispheres. The clouds are composed of methane ice crystals. In the Hubble images, absorption of red light by methane in Neptune's atmosphere gives the planet its distinctive aqua color. The clouds look pink because they are reflecting near-infrared light. A faint, dark band near the bottom of the southern hemisphere is probably caused by a decrease in the hazes in the atmosphere that scatter blue light. NASA/ESA/STScI/AURA
Neptune Completes First Revolution Since Discovery
A color image composed of exposures made through three color filters shows the disk of Neptune, revealing clouds in its atmosphere. 48 separate images from a single filter were brightened to reveal the very faint moons. The white dots are Neptune's inner moons moving along their orbits during Hubble's observations. The solid green lines trace the full orbit of each moon. NASA/ESA/Z. Levay
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