At this pit on Mars, the steep slope at the northern edge (toward the top of the image) exposes a cross-section of a thick sheet of
underground water ice.
Not exact matches
The MARSIS radar, which will soon be deployed on Mars Express, should be able to detect
underground liquid
water but may have trouble differentiating between
ice and rocky soil.
The discovery of waterlogged minerals and a growing
ice wall suggests that the dwarf planet could harbor
underground liquid
water or slushy brine, which has escaped through cracks and craters in the recent past and may still be seeping out today.
Researchers previously used MRO's Shallow Radar (SHARAD) to map extensive
underground water -
ice sheets in middle latitudes of Mars and estimate that the top of the
ice is less than about 10 yards beneath the ground surface.
«It's very cool, because
water can go
underground, it can move around the ocean, it can change from
ice to liquid and runoff, but it can't hide its mass from us,» says Watkins.
They are linked by rivers that form when melting
ice expands the lakes, increasing pressure under the
ice cap and causing
underground channels of
water and mud to squirt out.
Lakes may form when meteorite impacts heat
ice in the crust or when
underground reservoirs of
water kept liquid by geothermal heat leak onto the surface.
A new study by scientists at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, and the University of California, Irvine, shows that while
ice sheets and glaciers continue to melt, changes in weather and climate over the past decade have caused Earth's continents to soak up and store an extra 3.2 trillion tons of
water in soils, lakes and
underground aquifers, temporarily slowing the rate of sea level rise by about 20 percent.
It also provides a solution to three puzzles: we now know why rivers formed where they are observed today; why
underground reservoirs of
water ice, until now considered anomalous, are located far from the poles of Mars; and why the Tharsis dome is today situated on the equator.
Although most of the
water on Mars is locked up in
ice, the possibility remains that some liquid
water could exist in
underground aquifers.
The spacecraft carries the first radar instrument ever flown to Mars which has returned pioneering sub-surface sounding measurements that show
underground water -
ice deposits.
The latest data from the Dawn space probe points to
underground ice flows and a
water vapour atmosphere.
So the discovered traces of
water -
ice suggest some
underground ice was recently exposed and that there must be some mechanism to explain how the surface was disturbed in this way.
This constant flexing of Europa by Jupiter's immense gravity melts its interior in the same way it melts that of neighboring moon Io, in essence keeping the
water ice layers in the interior of Europa in a liquid state that form a global
underground ocean.
It's possible that
water from the
underground ocean itself could be forced through Europa's
ice shell to erupt on the surface.
So to address the first concern, four families worked with the World Wildlife Fund to create polar - bear resistant food storage containers that can be stored above ground, rather than
underground where traditional
ice cellars - some more than 100 years old and upwards of 12 feet deep - are beginning to melt and fill with
water.