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Natural Color with Satellites.
New NASA Hubble Space Telescope images of the distant planet Neptune show a dynamic atmosphere and capture the fleeting orbits of its satellites. The images have been assembled into a time-lapse movie revealing the orbital motion of the satellites.
Images were taken in 14 different colored filters probing various altitudes in Neptune's deep atmosphere so that scientists can study the haze and clouds in detail.
The natural-color view of Neptune, common to naked eye telescopic views by amateur astronomers, reveals a cyan colored planet. Methane gas in Neptune's atmosphere absorbs most of the red sunlight hitting the planet, making it look blue-green. The image was created by combining images in red, green, and blue light.
The planet is so dark at the methane wavelengths that long exposures can be taken, revealing some of Neptune's smaller moons. Clockwise from the top, these moons are Proteus (the brightest), Larissa, Despina, and Galatea. Neptune had 13 moons at last count.
Neptune is the most distant giant planet in our Solar System, orbiting the Sun every 165 years. It is so large that nearly 60 Earths could fit inside it. A day on Neptune is between 14 hours and 19 hours. The inner two thirds of Neptune is composed of a mixture of molten rock, water, liquid ammonia and methane. The outer third is a mixture of heated gases comprised of hydrogen, helium, water and methane.
September 1, 2005
Credit: NASA, ESA, E. Karkoschka (University of Arizona), and H.B. Hammel (Space Science Institute, Boulder, CO)