Outer Planets
Overview
The outer solar system is by far the least-studied part of the solar system. The planets that this includes are Jupiter, Saturn, Uranus, Neptune, and Pluto.
The outer planets are those planets that orbit far from the Sun. They are: Jupiter, Saturn, Uranus, Neptune, and Pluto.
THE OUTER PLANETS
THE DISCOVERY
In 1781 William Herschel while viewing the sky from his garden in Bath, England recognized that an object in the constellation of Gemini was moving against the background of stars.
Probes to the Outer Planets
Pioneer 10 was the first spacecraft to penetrate the asteroid belt between Mars and Jupiter and travel to the outer regions of the solar system.
Explorations of Outer Planets
Pioneer 10 and 11 blazed the trail to the outer solar system during the 1970s. Pioneer 10 became the first spacecraft to visit any planet beyond the asteroid belt when it flew past Jupiter on December 3, 1973.
Breakfast with the Outer Planets
Jupiter, Saturn, Uranus and Neptune presented amateur astronomers with quite a delight over the winter in the evening sky, and this week, we may see these same outer planets in the eastern sky just before sunrise.
Outer planets. The Sun's heat was not as strong farther out in the nebula. Cooler temperatures allowed chunks of ice, floating among the rocks in the hydrogen and helium cloud, to grow.
Outer Planets
For the outer planets, the division is more distinct, with the inner two gas giants, Jupiter and Saturn being quite different in many ways from the outer two gas giants, Uranus and Neptune.
OUTER PLANETS
The outer planets are those planets that orbit far from the Sun. They are: Jupiter, Saturn, Uranus, Neptune, and Pluto.
Outer planets form. By 107 years, gas in the protoplanetary disc has been blown away, and outer planet formation is likely complete.[25]
1 Ã- 107-8 years ...
The outer planets Uranus, Neptune, and Pluto were unknown to ancient astronomers. Uranus was discovered in the eighteenth century, by chance.
The outer planets which cannot be seen with the naked eye and were discovered in the past three centuries have since been incorporated into astrology; however, because their years are so long there is still debate about the forces they represent.
The outer planets have many but most of these are not moons in the sense that the backyard stargazer thinks of "moons".
There are regular moons and irregular moons in the solar system.
The outer planets are much more massive than the terrestrial planets and have immense atmospheres composed mainly of hydrogen (H) and helium (He).
The outer planets, Mars, Jupiter, Saturn etc, can never be at inferior conjunction with the Sun, only at superior conjunction (just called "conjunction"). On the other hand they can be on the opposite side of the Earth to the Earth.
The four outer planets (not to scale)
The four outer planets, or gas giants, (sometimes called Jovian planets) are so large they collectively make up 99 percent of the mass known to orbit the Sun.
The four outer planets, the gas giants, are substantially more massive than the terrestrials.
The four outer planets, or gas giants (sometimes called Jovian planets), collectively make up 99 percent of the mass known to orbit the Sun. Jupiter and Saturn's atmospheres are largely hydrogen and helium.
OPUS, our Outer Planets Unified Search tool, allows users to search for and obtain subsets of data based on a wide range of constraints. At this time the the tool's support for Cassini data is limited to CIRS, ISS and VIMS.
Mars is the outer planet closest to us, and seems in some way most Earth-like: it rotates in a little more than 24 hours, it has a thin atmosphere and extinct volcanoes, and its inclination to the ecliptic is close to Earth's, ...
outer planets (NASA SP-7, 1965) The planets with orbits larger than that of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto. outer product (NASA SP-7, 1965) = vector product.
The four planets nearest the sun are called inner planets; the others, outer planets. The four largest planets are called major planets. The four planets commonly used for celestial observations are called navigational planets.
The Voyagers also yielded more accurate masses for the outer planets -- when these updated masses were inserted in the numerical integrations of the solar system, the residuals in the positions of the outer planets finally disappeared.
The accompanying figure shows the form of the outline, as it would appear to an observer on an outer planet were the light of the sun cut off.
Office of Naval Research - Solar System: Outer Planets - Neptune How Stuff Works - Science - Neptune Explained National Geographic - Science and Space - Neptune Window To The Universe - Neptune Window To The Universe - A ...
Bodies in the solar system with real retrograde orbits include certain moons of the outer planets, and some asteroids and comets.
One of the tricky points that Ptolemy tackled was the retrograde motion of the outer planets. He was able to combine several previously proposed devices with some of his own into a system that actually worked.
A year later, the Dutch-born American astronomer Gerard Kuiper (1905-1973) pointed out that there should be comet-like objects remaining in the outer planetary region after the solar system formation process was complete..
This relied on the observation that an outer planet had wobbles in its orbit which seemed to be caused by an undiscovered body further out. Careful calculation of Uranus' wobbles had led directly to the location of Neptune.
As their dead helium cores contract, heating and firing to fuse the helium to carbon and oxygen, the stars expand to approach the sizes of the orbits of the outer planets, becoming distended red "supergiants.
The Spitzer Space Telescope will study the infrared emission from the outer planets and moons in our solar system.
The outer planets are hydrogen rich gas giants. The moons of the outer planets are low density, icy-rocky bodies.
To launch a spacecraft from Earth to an outer planet such as Mars using the least propellant possible, first consider that the spacecraft is already in solar orbit as it sits on the launch pad.
After 11 years of observations, two additional outer planets were discovered with two other teams of astronomers at the Harvard-Smithsonian Center for Astrophysics and the High Altitude Observatory using the Whipple Observatory (1999 press release).
The simulation implied that a clump can form within the disc in a resonance with a more massive outer planet. "It showed that migration [of a planet into the outer system] was necessary to scatter dust into a 2:1 resonance," says Patience.
In this example conjunction is the position of the outer planet (in orange) in relation to the Earth when the outer planet is at the opposite side of the Sun to the Earth.
The inner planets (those planets that orbit close to the Sun) are quite different from the outer planets (those planets that orbit far from the Sun). The inner planets are Mercury, Venus, Earth, and Mars.
The Oort cloud, while roughly spherical at the largest radius, is wedge-shaped where it merges with the outer planet region in the vicinity of the Kuiper belt of comets.
Another important difference is that the outer planets are made up largely of gas, and water, while the inner planets are made up almost entirely out of rock and dust. This is due to the same reasons.
The surfaces of the icy satellites of the outer planets are scarred by impacts from comet nuclei. Indeed, the asteroidal object Chiron, with an orbit between Uranus and Neptune, was itself determined, in 1989, to be an extremely large inactive comet.
Seen here is a full-scale model of one of the twin Voyager spacecraft, which was sent to explore the giant outer planets in our solar system. Voyager 2 was launched August 20, 1977 followed by the launch of Voyager 1 sixteen days later.
They cross the orbits of one or more of the giant planets in their journey around the Sun, and interactions with these outer planets cause the orbits of Centaurs to be inherently unstable.
This contains measurements of some 180,000 positions, proper motions and magnitudes for stars down to magnitude 15 and over 25,000 positions and magnitudes of 180 Solar System objects ranging from the outer planets including Pluto to some of the ...
Definition: ice as rock: Water-ice (frozen H20) is an important geologic material on many of the outer planet satellites.
It began ejecting material when still at the distance of the outer planets, so it was discovered while still a couple of years from its perihelion passage in March of 1997. Comet Hyakutake (bright comet of spring 1996 that passed within 0.1 A.U.
A Dictionary of Earth Sciences entry for outer planet
The Oxford Companion to the Earth entry for Jovian planets
Free newspaper and magazine articles
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Asteroid Belt
Delineating the boundary between the inner and outer planets.
Jupiter
Jupiter's massive size ensures that it's gravity acts almost like a hoover for smaller planetary bodies in the solar system.
Visit our Mission to Outer Planets thematic area for teacher-built activity bundles that tell the whole exploration story.
They were gravitationally perturbed by the accreting outer planets into extremely elongated orbits. Hundreds of millions of comet nuclei exist in a spherical region called the Oort cloud that surrounds the solar system.
The material in between the planets in the solar system, including that within the Earth's radius and out to and beyond the outer planets.
As we have explored the outer planets in more detail, we now know that there are multiple ring systems in the Solar System. None are as spectacular as that of Saturn, but we now view rings as common occurences.
Pioneer
Pioneer 10 and 11 were the first probes to explore the outer planets in the 1970's.
Pioneer Venus
The NASA probe to first map the surface of Venus in the late 1970's.
3 A planet is in opposition when Earth is between it and the Sun. This is an outer planet's point of closest approach to Earth.
This gaseous, giant outer planet has a visible ring system and over 20 moons, the largest of which is Titania. Uranus is tipped on its side, with a rotation axis in nearly the same plane as its orbit.
2. Apparent retrograde motion is the westward motion of a planet with respect to the stars which occurs near opposition (outer planets) or near inferior conjunction (inner planets).
I also checked a recent Sky & Telescope article on the moons of the outer planets. The map they had for Himalia also agreed with version 4 of Red Shift and the Horizons program.
(a) Pair of unmanned American spacecraft launched in 1977 on missions to Jupiter, Saturn, and beyond. [F88]
(b) Series of US spaceprobes launched to carry out exploration of the outer planets. In 1982 Voyager 2 returned remarkable pictures of Saturn.
Series of US spaceprobes the first 9 of which concentrated predominantly on Solar exploration and research. From then on, Pioneer probes have been sent to the outer planets of the Solar System. [A84]
Pitch Angle ...
Stranieri in America 1988
Oltre New York 1986
Voyage to the Outer Planets and Beyond 1986
Target... Earth? 1980
The Dick Cavett Show ...
space rocks to help us learn about the origin of our solar system. Asteroids are thought to be the leftovers from the formation of the inner solar system, including Earth. Comets are thought to be leftovers from the formation of the outer planets.
 See also: Planet, Earth, Orbit, Solar, Sun
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