 Eye on Neptune presented by Science at NASA It is an ice giant, a planet of monster storms and a recluse, rarely seen. However, on the night of September 9th, the planet Neptune will be at opposition, the yearly event where Earth passes directly between Neptune and our Sun. Sky watchers and astronomers will take the opportunity to observe this planet that is invisible to the naked eye, but that scientists would love to see more clearly. When it is near opposition, Neptune reaches as high as point in the sky around midnight. This makes evenings in September the best time to grab your telescope or high-powered binoculars and use a sky chart or sky-watching software to view this planet that is 30 times farther from the Sun than Earth. When you find this elusive planet that appears as a mere dot and most amateur telescopes, remember that you are actually viewing a planet with a thick atmosphere that is composed of massive amounts of hydrogen and helium with traces of other gases. That atmosphere surrounds a solid interior of rock and a warm mantle of dense fluid deep beneath the clouds. This opposition event also comes just after the 30th anniversary of the Voyager 2 spacecrafts by-bye of the planet in 1989. Voyager 2 provided our closest glimpse of Neptune, passing about 3,000 miles or about 5,000 kilometers above its north pole. The pictures Voyager 2 sent back gave scientists a new snapshot of weather in the extreme, including a dark and violent vortex that looked similar to the Great Rat Spot on Jupiter. Since then, observatories such as the Hubble Space Telescope have given us additional observations of the planet from afar. NASA scientists have learned, for instance, that unlike Jupiter, the Neptune vortex disappears for a time and then similar storms appear later. Scientists have determined that Neptune has seasons such as those on Earth, but that these are much longer, spanning decades instead of months. By studying these seasons on a continual basis, scientists look to gain a better understanding of the similarities and differences of atmospheres on other planets, including right here on Earth. So consider taking a look at the ice giant planet Neptune in September and you'll see why it captures the imagination of so many scientists and astronomers. Grab your telescope, step outside, and enjoy the view. For more details on Neptune and the other planets in our solar system, visit science.nasa.gov.