piątek, 20 października 2017
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Astronomia (437)

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Showing the circumstances for a solar and lunar eclipse. The top illustration demonstrates the needed circumstances for a solar eclipse, and the bottom for a lunar eclipse.
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Artwork showing a supernova as viewed from the moon.
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Artwork showing the asteroid Ida against a background of stars and Comet Hale-Bopp.
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Asteroid impact.
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Fantasy image of asteroid moving towards Earth.
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Conceptual image of the Big Bang theory.
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The giant planet, 51 Pegasus, bakes under the heat of its parent star. Lightning flashes in its atmosphere and auroral displays shimmer over the polar regions, a possibility if it has a magnetic field. Any moons, such as the captured asteroid in the foreground, would glow red hot from the temperatures of nearly 1800 degrees Fahrenheit.
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Photo illustration of Galaxy spiral based on Messier 83 (M83).
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Nebula with planets forming.
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Orion nebula and planets.
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Nebula interior with planets.
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Comet Shoemaker-Levy 9 impacting Jupiter.
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Echoes of the early Universe. False-colour microwave map of the whole sky, showing variations or "ripples" in the cosmic microwave background. The mean temperature of the background radiation (2.73 degrees Kelvin) is shown as deep blue; pink and red areas are warmer while blue areas are cooler - red is +0.27 milliKelvins (mK), pale blue is -0.27mK. Computer analysis of the image shows that the pattern of fluctuations in the background is consistent with the inflationary 'Big Bang' theory of the creation of the Universe, and the existence of invisible 'dark matter'. The data for this image were gathered by the Cosmic Background Explorer (COBE) satellite. With text lines
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Calendar of the Universe, computer illustration. The Universe is estimated to be about 14 billion years old. This diagram presents the history of the Universe compressed into a single year, showing the relative timing of major events. It illustrates that the origin of complex life on Earth is relatively recent on a cosmological scale with the first animals not appearing until December 10. On this timescale, the whole history of human civilization is equivalent to the final minute of the year.
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Pulsar. Computer illustration of a pulsar showing its emission mechanism. Pulsars are rapidly rotating neutron stars which cast out narrow beams of energy (blue) as they rotate. The beams are confined by extremely strong magnetic fields (green). Any pulsar whose beam chances to cross Earth will appear to be flashing like a lighthouse, with regular pulses of energy sweeping across Earth. Pulsars rotate extremely fast, with periods ranging from hundredths of seconds to a few seconds. The pulse is visible from radio to X- ray wavelengths. Pulsars are formed in supernova explosions, and are composed of the star's collapsed core at the density of nuclear matter.
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Phases of the Moon, computer illustration. As the Moon orbits the Earth, the area that is illuminated appears (from the Earth's surface) to change in size, producing the phases shown. The Moon is always half-illuminated by the Sun (out of frame to the right of this image). The phases arise because the observer sees more or less of the illuminated side as the angle of observation varies. The Moon rotates so that it always presents the same face to the Earth. It does not have a "dark side" because it is rotating with respect to the Sun. The mean length of the cycle of phases (a lunar or synodic month) is 29.53 days.
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PHOTO: EAST NEWS/BSIP Le mirage gravitationnel. Repr??sentation du mirage gravitationnel. Ou comment expliquer que l'image d'une galaxie observ??e de la terre est d??form??e par un amas de galaxies situ?? entre les deux.
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PHOTO: EAST NEWS/BSIP Les phases de la Lune. Repr??sentation des diff??rentes phases de la Lune, huits positions sur l'orbite terrestre qui permet de voir l'angle de vue de la Lune depuis la Terre.
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Extrasolar planet. Artwork of the extrasolar planet HD 189733b, a Jupiter-sized planet approximately 63 light years away in the constellation Vulpecula, orbiting its companion star HD 189733. Observations of this planet have found water vapour and methane in its atmosphere and it is the first extrasolar planet found to contain carbon dioxide in its atmosphere.
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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Gravitational wave detector, computer artwork. Gravitational wave detectors use laser beams to investigate cosmological features that are thought to emit gravity waves.
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