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Breaking News: Europa and other planetary bodies may have extremely low-density surfaces - News Paper-News of the United States was founded in 1933 by David Lawrence (1888-1973), which also started the World Report in 1946. The two magazines are covering national and international news separately, but Lawrence combines them into news reports of U.S. in World and 1948 [1] and Later sold the magazine to its employees. Historically, this magazine tends to be a bit more conservative than the two main competitors, Time and Newsweek, and focus more on the story of economic, health, and education. It's also distancing news, entertainment and sports celebrities. [2] an important milestone in the history of the beginning of the magazine is including the introduction of the "Washington Whispers" column in 1934 and the column "News You Can Use" in 1952. [3] [4] in 1958, the circulation of the weekly magazine passed one million and two million in 1973. (
wikipedia) Breaking News: Europa and other planetary bodies may have extremely low-density surfaces - News Paper
Spacecraft landing on Jupiter's moon Europa could see the craft sink due to high surface porosity, research by Planetary Science Institute Senior Scientist Robert Nelson shows.
 |
This enhanced-colour view shows a 350 by 750 kilometer swath across the surface of Jupiter’s moon Europa. Research
by Robert Nelson of the Planetary Science Institute shows that Europa’s surface could be 95 percent porous, allowing
visiting spacecraft to sink into the moon’s surface [Credit: NASA/JPL-Caltech/SETI Institute] |
Nelson was the lead author of a laboratory study of the photopolarimetric properties of bright particles that explain unusual negative polarization behavior at low phase angles observed for decades in association with atmosphereless bodies including asteroids 44 Nysa, 64 Angelina and the Galilean satellites Io, Europa and Ganymede.
These observations are explained by extremely fine-grained particles with void space greater than about 95 percent. Grain sizes would be on the order of the wavelength of light of the observations (a fraction of a micron). This corresponds to material that would be less dense than freshly fallen snow, raising questions about the risk of a Europa lander sinking into the surface of the Jupiter satellite.
Observations were made using a goniometric photopolarimeter of novel design located at Mt. San Antonio College in Walnut, California. The powders used were aluminum oxide (Al2O3), which is an excellent regolith analog for high albedo airless bodies in the solar system, including water ice bodies such as Europa.
"Of course, before the landing of the Luna 2 robotic spacecraft in 1959, there was concern that the Moon might be covered in low density dust into which any future astronauts might sink," Nelson said. "However, we must keep in mind that remote visible-wavelength observations of objects like Europa are only probing the outermost microns of the surface."
This work was partially supported by a contract from the NASA Jet Propulsion Laboratory to PSI in support of the NASA Cassini Saturn Orbiter Visual and Infrared Mapping Spectrometer instrument team.
This work was
published in the journal Icarus.
Source: Planetary Science Institute [January 25, 2018]
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Breaking News: Europa and other planetary bodies may have extremely low-density surfaces - News Paper
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