Confused Mercury Crater Looks Icy, But May Be Evaporation Evidence

At first glance, you’d think that white stuff on the floor of Kertesz crater is ice, especially since that substance has been confirmed on its home planet — Mercury. This new shot of the 19-mile (31-kilometer) crater in the Caloris basin shows off irregular depressions, or hollows, that jump out in this color-enhanced picture taken by NASA’s MESSENGER spacecraft. More close-up pictures from previous passes are below the jump.

“The bright material on the floor of Kertész crater is not the water ice recently confirmed to be in craters near Mercury’s poles, but it might well be behaving as ice would on another planet,” NASA wrote in 2012.

“Mercury’s daytime temperatures are so hot at most latitudes that rocks that would be stable at other places in the Solar System may essentially evaporate on Mercury. That is one theory for the formation of these bright, irregular features known as hollows seen here and in many other craters on Mercury.”

There’s still much to learn, so scientists are probably grateful that MESSENGER is still working beyond its design lifetime. It was originally supposed to conclude in 2011, but its mission was extended further to see the effects of the solar maximum on the solar system’s closest planet to the sun.

This photomosaic shows the Kertesz crater on Mercury on the planet’s Caloris Basin, as seen by NASA’s MESSENGER mission. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
A side view of Kertész crater on Mercury, as imaged by NASA’s MESSENGER spacecraft. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
A 3-D view of Kertesz crater in Mercury’s Caloris Basin. Mosaic from NASA’s MESSENGER spacecraft. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Elizabeth Howell

Elizabeth Howell is the senior writer at Universe Today. She also works for Space.com, Space Exploration Network, the NASA Lunar Science Institute, NASA Astrobiology Magazine and LiveScience, among others. Career highlights include watching three shuttle launches, and going on a two-week simulated Mars expedition in rural Utah. You can follow her on Twitter @howellspace or contact her at her website.

Recent Posts

Gaze at New Pictures of the Sun from Solar Orbiter

74 million kilometres is a huge distance from which to observe something. But 74 million…

12 minutes ago

Are Fast Radio Bursts Caused by Interstellar Objects Crashing Into Neutron Stars?

Astronomers have only been aware of fast radio bursts for about two decades. These are…

5 hours ago

Here’s How to Weigh Gigantic Filaments of Dark Matter

How do you weigh one of the largest objects in the entire universe? Very carefully,…

7 hours ago

How Could Astronauts Call for Help from the Moon?

Exploring the Moon poses significant risks, with its extreme environment and hazardous terrain presenting numerous…

19 hours ago

There Was a 15 Minute Warning Before Tonga Volcano Exploded

Volcanoes are not restricted to the land, there are many undersea versions. One such undersea…

20 hours ago

Main Sequence and White Dwarf Binaries are Hiding in Plain Sight

Some binary stars are unusual. They contain a main sequence star like our Sun, while…

21 hours ago