More than 400 years after its discovery by Galileo, Io, the innermost large moon of Jupiter, now has a global geologic map made by a group of scientists including David A. Crown of the Planetary Science Institute. The map, which was published by the U.S. Geological Survey, illustrates the geologic character of some of the most unique and active volcanoes ever documented in the solar system.
Io is a celestial body whose gravitational relationships with Jupiter and sister moons Europa and Ganymede cause massive, rapid changes of its surface and interior. This pulsating generates tremendous heat in Io's interior, which is relieved through massive surface volcanism, resulting in 25 times more volcanic activity than occurs here on Earth.
This highly detailed, colorful map reveals a number of volcanic features, including volcanic domes and depressions, lava flow fields, mountains, plume deposits and sulfur-rich plains. Despite this geologic diversity, there is one particular feature that is common to the Moon, Mars and even Earth that is missing on the geologic map of Io, impact craters. It has none simply because it is so geologically active so its surface is constantly "refreshed" by new sheets of lava. Any craters on this moon are short-lived.
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Summer nights are the perfect time to be outdoors. Here are a few ideas for your night sky viewing this weekend. If clouds block your view, chances are you will have a cool lightning show instead!
See the five closest planets in the evening sky this week! Sky cover conditions for the next couple of nights are detailed.
There is a lot to see in the night sky this July Fourth holiday weekend. With the new moon soon, the Milky Way will be visible. Also, see the planets shimmer, search for the highest clouds on Earth and perhaps catch a glimpse of the aurora or a stray meteor. Sky viewing conditions are detailed for each night through Independence Day.
There is a lot to see in the night sky this July Fourth holiday weekend. See the planets shimmer, search for the highest clouds on Earth and perhaps catch a glimpse of the Aurora. Sky viewing conditions are detailed for each night through Independence Day.
The fickle June Bootids meteor shower is only a few days away. It will peak Sunday night, but the level of activity is unknown.
AccuWeather Astronomy fans from across the country share their pictures of Monday's Full Strawberry Moon.