Outgassing Collection

Kuiper Belt Object geysers, artwork
Kuiper Belt Object geysers. Artwork of erupting geysers on the surface of a Kuiper Belt Object. Overhead is a moon, with the Sun (yellow dot) in the far distance

Comet ISON, April 2013 C015 / 9817
Comet ISON (C/2012 S1), as observed on 10 April 2013 by the Hubble Space Telescope (HST). This comet was discovered on 21 September 2012 by the International Scientific Optical Network (ISON)

Comet ISON, April 2013 C015 / 9816
Comet ISON (C/2012 S1), as observed on 10 April 2013 by the Hubble Space Telescope (HST). This comet was discovered on 21 September 2012 by the International Scientific Optical Network (ISON)

Comet nucleus, computer artwork
Comet nucleus. Computer artwork of the nucleus (centre) of a comet, surrounded by gas and dust that has erupted or boiled from its surface

River flowing over travertine deposits at Plitvice National Park, Croatia. Travertine is a mineral precipitated from streams super- saturated with bicarbonates

Plitvice National Park
Plitvice national Park, Croatia. Series of lakes and waterfalls separated by travertine dams. Travertine is a mineral precipitated from streams super-saturated with bicarbonates

Travertine dam. River cascading over a travertine dam at Plitvice National Park, Croatia. Travertine is a mineral precipitated from streams super- saturated with bicarbonates

Travertine ridge at Drevenik National Nature Reserve, Slovakia. The layers of limestone rock seen here were formed successively by the precipitation of calcium carbonate from ground water emerging

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