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A team of Spanish and US astronomers used NASA's Hubble Space Telescope to study how the gas stream rams into the surrounding material, shown in blue. They believe that such interactions dominate the formation process in planetary nebulae. Due to the high speed of the gas, shock-fronts are formed on impact and heat the surrounding gases.
Theoretical planetologists also use numerical models to understand how the Solar System planets were formed and develop in the future, their thermal evolution, their tectonics, how magnetic fields are formed in planetary interiors, how convection processes work in the cores and mantles of terrestrial planets and in the interiors of gas giants ...
The NPV, thus, plays a decisive dynamical role to stabilize hexagon jets. The influence of moist convection, which was recently suggested to be at the origin of Saturn's NPV system in the literature, is investigated in the framework of the barotropic rotating shallow water model and does not alter the conclusions. [25]
William Kenneth Hartmann (born June 6, 1939) is an American planetary scientist, artist, author, and writer.He was the first to convince the scientific mainstream that the Earth had once been hit by a planet sized body (), creating both the Moon and the Earth's 23.5° tilt.
Standish worked on the Jet Propulsion Laboratory Development Ephemeris.. Early versions refined the accuracy of these fundamental astronomical data-sets by including many recent and accurate observational data, new types of data, using improved data processing methods, including refined equations of motion which more accurately described the actual physics of the solar system. [1]
Located on Ishtar Terra, the more northern of the planet's two major highlands, Maxwell Montes is 11 kilometres (36,000 ft) high. [1] It rises about 6.4 kilometers above and to the east (21,000 ft above, and 4 miles (6.44 km) to the east) of Lakshmi Planum, and is about 853 kilometres (530 mi) long by 700 kilometres (435 mi) wide. [1]
This article is a list of notable unsolved problems in astronomy.Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results.
Mars Exploration Program at NASA.gov; Google Mars and Google Mars 3D, interactive maps of the planet; Geody Mars, mapping site that supports NASA World Wind, Celestia, and other applications; Images. Mars images by NASA's Planetary Photojournal; Mars images by NASA's Mars Exploration Program; Mars images by Malin Space Science Systems