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المصدر : قناة morn1415
المصدر : قناة morn1415
From year to year, the moon never seems to change. Craters and other formations appear to be permanent now, but the moon didn't always look like this. Thanks to NASA's Lunar Reconnaissance Orbiter, we now have a better look at some of the moon's history. Learn more in this video!
This video is public domain and can be downloaded at: goto?10930
Though close to home, the space immediately around Earth is full of hidden secrets and invisible processes. In a new discovery reported in the journal Nature, scientists working with NASA’s Magnetospheric Multiscale spacecraft — MMS — have uncovered a new type of magnetic event in our near-Earth environment by using an innovative technique to squeeze extra information out of the data. Magnetic reconnection is one of the most important processes in the space — filled with charged particles known as plasma — around Earth. This fundamental process dissipates magnetic energy and propels charged particles, both of which contribute to a dynamic space weather system that scientists want to better understand, and even someday predict, as we do terrestrial weather. Reconnection occurs when crossed magnetic field lines snap, explosively flinging away nearby particles at high speeds. The new discovery found reconnection where it has never been seen before — in turbulent plasma.
Music credits: ‘Think Tank’ and ‘Natural Time Cycles’ by Laurent Dury from Killer Tracks
Welcome to the Tour of the Electromagnetic Spectrum. This unique NASA resource on the web, in print, and with companion videos introduces electromagnetic waves, their behaviors, and how scientists visualize these data. Each region of the spectrum is described and illustrated with engaging examples of NASA science. Come and explore the amazing world beyond the visible!
Something mysterious is going on at the Sun. In defiance of all logic, its atmosphere gets much, much hotter the farther it stretches from the Sun’s blazing surface.
Temperatures in the corona — the tenuous, outermost layer of the solar atmosphere — spike upwards of 2 million degrees Fahrenheit, while just 1,000 miles below, the underlying surface simmers at a balmy 10,000 F. How the Sun manages this feat remains one of the greatest unanswered questions in astrophysics; scientists call it the coronal heating problem. A new, landmark mission, NASA’s Parker Solar Probe — scheduled to launch no earlier than Aug. 11, 2018 — will fly through the corona itself, seeking clues to its behavior and offering the chance for scientists to solve this mystery.
From Earth, as we see it in visible light, the Sun’s appearance — quiet, unchanging — belies the life and drama of our nearest star. Its turbulent surface is rocked by eruptions and intense bursts of radiation, which hurl solar material at incredible speeds to every corner of the solar system. This solar activity can trigger space weather events that have the potential to disrupt radio communications, harm satellites and astronauts, and at their most severe, interfere with power grids.
Above the surface, the corona extends for millions of miles and roils with plasma, gases superheated so much that they separate into an electric flow of ions and free electrons. Eventually, it continues outward as the solar wind, a supersonic stream of plasma permeating the entire solar system. And so, it is that humans live well within the extended atmosphere of our Sun. To fully understand the corona and all its secrets is to understand not only the star that powers life on Earth, but also, the very space around us.
Music credits: “Developing Over Time” by Ben Niblett [PRS], Jon Cotton [PRS], “Eternal Circle” by Laurent Dury [SACEM], “Starlight Andromeda” by Ben Niblett [PRS], Jon Cotton [PRS] Coronal spectrum image credit: Constantine Emmanouilidi Video credit: NASA's Goddard Space Flight Center Joy Ng (USRA): Producer Kathalina Tran (Wyle Information Systems): Writer Eric Christian Ph.D. (NASA/HQ): Scientist Nour Raouafi (Johns Hopkins University/APL): Scientist James A. Klimchuk (NASA): Scientist Ryan Milligan (University of Glasgow): Scientist Sten Odenwald (NASA/GSFC): Scientist Adrian Daw (NASA/GSFC): Scientist Tom Bridgman (GST): Data Visualizer Joy Ng (USRA): Animator Walt Feimer (KBRwyle): Animator Michael Lentz (USRA): Animator Kathalina Tran (Wyle Information Systems): Animator
#solarsystem #theuniverse #documentary
A solar system is a star and all of the objects that travel around it—planets, moons, asteroids, comets and meteoroids. Most stars host their own planets, so there are likely tens of billions of other solar systems in the Milky Way galaxy alone. Solar systems can also have more than one star. These are called binary star systems if there are two stars, or multi-star systems if there are three or more stars.
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One of the biggest questions in planetary science is whether life ever arose on Mars, and NASA is sending a cutting-edge instrument to the Red Planet to find out. The Mars Organic Molecule Analyzer, or MOMA, is a sophisticated suite of technologies that squeezes a lab full of chemistry equipment into a package the size of a toaster. In 2020, MOMA will be launched to Mars aboard the European Space Agency's ExoMars rover, on a mission to scour rocks and soil from the Martian surface and subsurface for evidence of life.
MOMA will not only search for organic molecules, which make up all life on Earth, it will also analyze their structure using its linear ion trap – the first use of this technology on Mars. Doing so will help scientists to determine whether the molecules could be of biological origin, marking a significant leap forward in the search for life beyond Earth.
MOMA's mass spectrometer subsystem and main electronics were built at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The pulsed UV laser and high-temperature ovens were developed in Germany, and the gas chromatograph in France. ExoMars is the primary Mars exploration program of the European Space Agency.
Credit: NASA's Goddard Space Flight Center/Dan Gallagher
William Brinckerhoff (NASA/GSFC): Lead Scientist
Veronica Pinnick (NASA/GSFC): Scientist
Dan Gallagher (USRA): Producer
Krystofer Kim (USRA): Animator
Joy Ng (USRA): Narrator
Dan Gallagher (USRA): Writer
William Steigerwald (NASA/GSFC): Science Writer
Rob Andreoli (AIMM): Lead Videographer
John Caldwell (AIMM): Videographer
Matthew R. Radcliff (USRA): Support
Aaron E. Lepsch (ADNET Systems Inc.): Technical Support
Music provided by Killer Tracks: "Fast Motion" by Stephen Daniel Lemaire, "Game Show Spheres 5-6" by Anselm Kreuzer, "Floating" by Ben Niblett & Jon Cotton
Nominated for an Academy Award, this 36-minute IMAX production offers a state of the art, computer generated journey through the universe, and tries to pinpoint the role of human beings cohabitating within its vastness.
Among the topics included are a variety of the greatest scientific theories known to exist - some of which had never before been visualized on film - as well as a guided tour through the cosmos and solar system, and a look at the nature of black holes and exploding supernovas.
Venus and Jupiter are converging for a spectacular conjunction in the sunset sky on August 27th.
A coordinated effort is being made by many nations around the world to detect and track near-Earth objects, such as asteroids.
Observatories including NASA’s Hubble Space Telescope found that the interstellar object named ‘Oumuamua gained an extra boost of speed, which likely comes from comet-like jets of gas.
Credit: NASA’s Goddard Space Flight Center/Katrina Jackson Music credit: "Midlands" by Marc Barrachina Sanchez [SGAE]; El Murmullo Sarao SGAE, Universal Sarao SGAE; SaraoMusic; Killer Tracks Production Music This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at: 12988