The Moon and Mars through Hubble's "Eyes"
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Mars-6.jpg36 - Mars on Dec. 3rd, 2007 (true colors; credits: NASA/HST)156 visiteMars observation taken Dec. 3rd, 2007; Longitude ~320° MareKromium
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Mars-7.jpg37 - Mars on Dec. 7th, 2007 (true colors; credits: NASA/HST)163 visiteMars observation taken Dec. 7th, 2007; Longitude ~140° MareKromium
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Mars-8.jpg38 - Mars Oppositions: 1995-2007 (true colors; credits: NASA/HST)181 visiteCaption NASA:"Every 26 months Mars is opposite the Sun in our nighttime sky. Since 1995, Mars has been at such an "opposition" with the Sun 7 times. A color composite from each of the 7 HST opposition observations has been assembled in this mosaic to showcase the beauty and splendor that is "The Red Planet".
This mosaic of all 7 globes of Mars shows relative variations in the apparent angular size of Mars over the years. Mars was the closest in 2003 when it came within 35 MMs (about 56 MKM) from Earth. The part of Mars that is tilted towards the Earth also shifts over time, resulting in the changing visibility of the Polar caps. Clouds and dust storms, as well as the size of the Ice Caps, can change the appearance of Mars on time scales of days, weeks, and months.
Other features of Mars, such as some of the large dark markings, have remained unchanged for centuries".MareKromium
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Mars-9.jpg39 - Mars Oppositions: 1995-2007 (Relative Positions and Sizes - true colors; credits: NASA/HST)108 visiteCaption NASA:"This illustration shows the relative positions of Earth and Mars at the last 7 Martian oppositions from 1995 through 2007. Opposition occurs when the Sun and Mars are on exact opposite sides of Earth, resulting in a full-phase for Mars, similar to a full moon.
The images of Mars show the Planet's apparent relative size at each opposition, as viewed by the Earth-orbiting Hubble Space Telescope.
Orbits of the inner planets are to scale".MareKromium
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Mars-9a.jpgCyclone!137 visiteNASA - Picture of the Day del 20 Maggio 1999:"Late last month (April 1999) a team of Mars-watching astronomers sighted an immense cyclonic storm system raging near the (...) North Pole. Their discovery picture, made with the HST on April 27, is seen at left while the projected insets (right) show closeups of the storm and surrounding areas. Shrunken to its martian midsummer state, Mars' north polar cap appears at the top of the picture and (...) it is clearly smaller than the storm just below it and farther left. Similar to the "spiral storms" detected on Mars over 20 years ago by the Viking spacecraft, this storm was marked by a system of swirling bright water-ice clouds instead of the billowing dust of a more typical martian wind storm. Measuring roughly 1.600 Km across (...) it was comparable in size to cyclones seen in planet Earth's polar regions. The storm (...) may have had a lifetime of only a few days". Commento: ma come si fa a dire che su Marte non piove da qualche milione di anni?!?!?!
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Mars-9~0.jpgMars, Deimos and Phobos169 visitenessun commentoMareKromium
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