پیش بینی ازون جو:

تعجب نکنید!!!

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اوزون جو امروز زمین:

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لایه‏ی ازون بالای قطب شمال

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وضعیت لایه‏ی اوزون بر فراز قطب جنوب

زیر نور ماورای بنفش چه خبر؟

One of a series, this image of Saturn was taken when the planet's rings were at their maximum tilt of 27 degrees toward Earth. Saturn experiences seasonal tilts away from and toward the sun, much the same way Earth does. This happens over the course of its 29.5-year orbit. Every 30 years, Earth observers can catch their best glimpse of Saturn's South Pole and the southern side of the planet's rings.

Between March and April 2003, researchers took full advantage to study the gas giant at maximum tilt, using NASA's Hubble Space Telescope to capture detailed images of Saturn's Southern Hemisphere and the southern face of its rings.

Image Credit: NASA and E. Karkoschka (University of Arizona)

47سال پیش خبر مهم فضایی چه بود؟

Forty-seven years ago today, astronaut Alan Shepard became the first American in space. He launched aboard his Mercury-Redstone 3, named Freedom 7, to make an historic 15-minute suborbital flight.

This image shows Shepard in capsule before launch. After several delays and more than four hours in the capsule, Shepard was ready to go, and he famously urged mission controllers to 'fix your little problem and light this candle.'

Image Credit: NASA

از مریخ چه خبر؟ کنکاش جدید داریم؟

Mesas in the Nilosyrtis Mensae region of Mars appear in enhanced color in this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO). The image, taken on April 5, 2007, is part of a campaign to examine more than two dozen candidate landing sites for the NASA Mars Science Laboratory rover, which is scheduled for launch in 2009.

This image shows a region of scientific interest to which the Mars Science Laboratory rover might drive. The rover would need to first land in a nearby area that is flatter and less rocky. Clay minerals have been detected in this region by imaging spectrometers on the European Space Agency's Mars Express orbiter and on MRO. These minerals are of great interest in the search for evidence of life on ancient Mars. Someday the capability may exist for precision landing and hazard avoidance, so a rover could be set down right next to such rugged outcrops of interest for study and perhaps for collection of rock samples for return to Earth.

Credit: NASA/JPL-Caltech/Univ. of Arizona

فونیکس

NASA's Phoenix Mars Lander was lowered into a thermal vacuum chamber at Lockheed Martin Space Systems, Denver, in December 2006 in preparation for launch on a mission to the Red Planet.

The spacecraft was folded in its aeroshell and underwent environmental testing that simulated the extreme conditions it will endure during the nine-and-a-half-month cruise to Mars.

The Phoenix is scheduled to land on May 25, 2008, and is expected to conduct a three-month mission studying a northern arctic site on Mars. Phoenix will dig into an ice-rich layer expected to lie within arm's reach of the Martian surface and will analyze the water and soil for evidence about climate cycles and investigate whether the environment there has ever been favorable for microbial life.

Image credit: NASA/JPL/UA/Lockheed Martin

فاصله تا تاریکی

Using the unique orbit of NASA's Spitzer Space Telescope and a depth-perceiving trick called parallax, astronomers have determined the distance to an invisible Milky Way object called OGLE-2005-SMC-001. This artist's concept illustrates how this trick works: different views from both Spitzer and telescopes on Earth are combined to give depth perception.

Our Milky Way galaxy is heavier than it looks, and scientists use the term "dark matter" to describe all the "heavy stuff" in the universe that seems to be present but invisible to our telescopes. While much of this dark matter is likely made up of exotic materials, different from the ordinary particles that make up the world around us, some may consist of dark celestial bodies -- like planets, black holes or failed stars -- that do not produce light or are too faint to detect from Earth. OGLE-2005-SMC-001 is one of these dark celestial bodies.

Although astronomers cannot see a dark body, they can infer its presence from the way light acts around it. When a dark body like OGLE-2005-SMC-001 passes in front of a bright star, its gravity causes the background starlight to bend and brighten, a process called gravitational microlensing. When the observing telescope, dark body, and star system are closely aligned, the microlensing event reaches maximum, or peak, brightness.

A team of astronomers first sensed OGLE-2005-SMC-001's presence when it passed in front of a star in a neighboring satellite galaxy called the Small Magellanic Cloud. In this artist's rendering, the satellite galaxy is depicted as the fuzzy structure sitting to the left of Earth. Once they detected this microlensing event, the scientists used Spitzer and the principle of parallax to figure out its distance. Humans naturally use parallax to determine distance. Each eye sees the distance of an object differently. The brain takes each eye's perspective and instantaneously calculates how far away the object is. To determine OGLE-2005-SMC-001's distance, astronomers measured the microlensing event over several months with both Spitzer in space and the Earth-based telescopes. Careful analysis of the data revealed the time of the peak brightness differed slightly between the two locations.

Because astronomers knew the exact distance between Earth and Spitzer and the time lag between the peak-observed brightness, they could determine OGLE-2005-SMC-001's speed. Using trigonometric equations and graphs to do the "brain's" job, scientists then inferred the dark body's location to be in the outer portion, or halo, of our galaxy.

Image credit: NASA/JPL-Caltech-ESA/Hubble and Digitized Sky Survey 2

فضا با عکس‎های سازمان فضایی ناسا-1

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Grady McCoy stands in the Langley Research Center's 16 foot transonic tunnel, as light reflects off the fan blades in this image from 1990.

As part of a national initiative to optimize government-owned wind tunnels, NASA's Langley Research Center shut down the tunnel and transitioned work to other facilities. The tunnel was placed on mothball status beginning Sept. 30, 2004, meaning that the facility could be made operational within six to 12 months and that maintenance to the tunnel would be limited to facility preservation only.

During its operational lifetime, the tunnel supported most major military programs both in their developmental stage and in on-going propulsion integration research. This long history has included all fighters since the 1960s, such as the F-14, F-15, F-18 and the Joint Strike Fighter. The tunnel has also supported NASA programs by doing extensive testing for the space shuttle, reusable launch vehicles, Hyper-X and other experimental programs.

Wind tunnels help researchers understand the forces acting on an object as it moves through the atmosphere and are used in conjunction with computers and flight simulators to learn about the flight characteristics of new aircraft designs and design modifications.

Image Credit: NASA