Could water have carved channels on Mars half a million years ago?

Could water have carved channels on Mars half a million years ago?

<span class='image-component__caption' itemprop="caption">Ceres' four-mile tall mountain is seen toward the center right of this photograph, taken by NASA's Dawn spacecraft on Aug. 19, 2015. </span>

Ceres' Four-Mile Tall 'Pyramid' Is Closer Than Ever, Still Puzzling

<span class='image-component__caption' itemprop="caption">Ceres' four-mile tall mountain is seen toward the center right of this photograph, taken by NASA's Dawn spacecraft on Aug. 19, 2015. </span>

In a decidedly wintry-looking scene, frost-filled fractures fills a crater near the north pole of Mars -- as observed by NASA's Mars Reconnaissance Orbiter.

In a decidedly wintry-looking scene, frost-filled fractures fills a crater near the north pole of Mars -- as observed by NASA's Mars Reconnaissance Orbiter.

Lava flows might explain a hot spot seen in data from Venus Express spacecraft.

Lava may be flowing from Venus volcano

Lava flows might explain a hot spot seen in data from Venus Express spacecraft.

This highest-resolution image from NASA's New Horizons spacecraft shows great blocks of Pluto's water-ice crust which appear jammed together in the informally named al-Idrisi mountains. Image released Dec. 4, 2015.<br />

This highest-resolution image from NASA's New Horizons spacecraft shows great blocks of Pluto's water-ice crust which appear jammed together in the informally named al-Idrisi mountains. Image released Dec. 4, 2015.<br />

This image, captured by NASA%u2019s Mars rover Curiosity on Sept. 25, 2015, shows a dark sand dune in the middle distance.

This image, captured by NASA%u2019s Mars rover Curiosity on Sept. 25, 2015, shows a dark sand dune in the middle distance.

PSP_001641_1735_RGB.NOMAP_50percent.jpg (2024×3405)

PSP_001641_1735_RGB.NOMAP_50percent.jpg (2024×3405)

DUST IN DEPTH  The Planck satellite analyzed the same patch of sky, shown here within the white dots, that the BICEP2 telescope measured in a search for primordial gravitational waves. Yellow and red patches contain the most galactic dust.

Dust erases evidence for gravity wave detection

DUST IN DEPTH The Planck satellite analyzed the same patch of sky, shown here within the white dots, that the BICEP2 telescope measured in a search for primordial gravitational waves. Yellow and red patches contain the most galactic dust.

Astronomy news: NASA's Spitzer Images Out-of-This-World Galaxy The galaxy, called NGC 1097, is located 50 million light-years away. It is spiral-shaped like our Milky Way, with long, spindly arms of stars. The "eye" at the center of the galaxy is actually a monstrous black hole surrounded by a ring of stars. In this color-coded infrared view from Spitzer, the area around the invisible black hole is blue and the ring of stars, white.

Astronomy news: NASA's Spitzer Images Out-of-This-World Galaxy The galaxy, called NGC 1097, is located 50 million light-years away. It is spiral-shaped like our Milky Way, with long, spindly arms of stars. The "eye" at the center of the galaxy is actually a monstrous black hole surrounded by a ring of stars. In this color-coded infrared view from Spitzer, the area around the invisible black hole is blue and the ring of stars, white.

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