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Earth's Geology
Earth and its surface features, what causes earthquakes and tsunamis, and why volcanoes form and erupt. -
Jan 1, 900
Earth's Geography & Atmosphere
Earth's interior is a complex structure of superheated rocks. Most geologists recognize three major layers: the dense core, the bulky mantle, and the brittle crust. ... Earth's core is mostly made of iron and nickel. It consists of a solid center surrounded by an outer layer of liquid. -
First Modern Telescope
Modern telescopes typically use CCDs instead of film for recording images. This is the sensor array in the Kepler spacecraft. -
Jupiter's Atmosphere, Geology & Geography
The atmosphere of Jupiter is the largest planetary atmosphere in the Solar System. It is mostly made of molecular hydrogen and helium -
Venus' Atmosphere & Geology
The atmosphere of Venus is mostly carbon dioxide, 96.5% by volume. Most of the remaining 3.5% is nitrogen -
Mars' Atmosphere & Geography
The atmosphere of Mars is about 100 times thinner than Earth's, and it is 95 percent carbon dioxide. Here's a breakdown of its composition: Carbon dioxide: 95.32 percent. Nitrogen: 2.7 percent. -
Mars' Geolology
Mars is a terrestrial planet that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. -
Saturn's Atmosphere
Saturn is made up predominantly of hydrogen, which it captured in the early stages of its formation. Most of the remaining composition is helium. Other elements, such as methane and ammonia, are found in small doses. Nitrogen and oxygen also mix within the atmosphere. -
Venus' Geography
Venusian geography. Venus, Mars and Earth, three out of the four inner or 'rocky' planets of the Solar System. -
Uranus' Geography & Geology
Uranus, with no solid surface, is one of the gas giant planets. -
Neptunes' Atmosphere, Geology & Geography
The atmosphere of Neptune is similar to all the large planets in the Solar System; it mostly consists of hydrogen and helium, with trace amounts of methane, water, ammonia and other ices. -
Hubble Telescope
The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990, and remains in operation. -
Mercury's Atmosphere, Geography & Geology
Mercury's atmosphere contains small amounts of hydrogen, helium, and oxygen. It also has even tinier amounts of sodium, potassium, calcium, and magnesium. -
Saturn's Geography & Geology
Physical characteristics of Saturn. Saturn is a gas giant made up mostly of hydrogen and helium. Saturn is bigenough to hold more than 760 Earths, and is more massive than any other planet except Jupiter, roughly 95 times Earth's mass. -
Future Telescope