PLANETS OF THE SOLAR SYSTEM

PLANETS OF THE SOLAR SYSTEM



1. Mercury

The smallest planet in the Solar System, Mercury is also the closest to the Sun. With little atmosphere and a slow rate of spin, on its long days and nights it goes from being hot enough to melt lead to cold enough to liquefy air.


2. Venus


Our planets's inner neighbour, Venus is sometimes described as Earth's twin, because the pair are similar in size, structure, and composition. But beneath Venus's dense clouds lies a scorching surface dominated by volcanism.



3.Earth
3.Bumi

The third planet from the Sun, Earth has many unique features. It is the only planet known to have an active plate-tectonics system, water flowing freely on its surface, and abundant life.




4. Mars
4. Mars

Water flowed across its surface in the long-distant past, but today the Red Planet-as Mars is known-is a cold, dry world, its surface sliced by a huge system of deep canyons and studded with giant, extinct volcanoes.




5. Jupiter
5. Jupiter



Within the Solar System, Jupiter is second only to the Sun in size and mass. Named after the most important Roman god, it is almost 2.5 times the mass of the other seven planets combined and has a large family of orbiting moons.


 
6. Saturn  
6. Saturnus

Pale yellow Saturn is distinguished from all other Solar System planets by the magnificent rings that girdle its equator. Saturn is the second-largest planets, with a large family of moons, it has been under intense scrutiny ever since the Cassini spacecraft moved into orbit around it in 2004.


7. Uranus
7. Uranus


Uranus is a blue, featureless world surrounded by a ring system and a family of moons. Its unremarkable stance is deceptive, and its sideways stance and long seasons make it stand out from the other planets.





8. Neptune
8. Neptunus

The outermost planet, Neptune is one of the coldest place in the Solar System. It is 30 times further from the Sun than Earth, and its cloud-top temperature is a freezing -201 C      (-330 F). Just one spacecraft, Voyager 2, has journeyed out to Neptune and shown us the planet and its rings and moon.


Sumber : SPACE,  from earth to the edges of the Universe

THE SOLAR SYSTEM

THE SOLAR SYSTEM


"How vast those Orbs must be, and how inconsiderable this earth, the Theatre upon which all out mighty Designs, all our Navigations, and all our Wars are transacted, is when compared to them."


THE SOLAR SYSTEM IS the region of space that falls within the gravitational influence of the Sun, an ordinary yellow star that has shone steadily for almost 5 billion years. After the Sun it self, the most significant objects in the Solar System are the planets - a group of assorted rocky, gaseous, and icy worlds  that follow independent, roughly circular orbits around their central star. Most of the planets are orbited in turn by moons, while a huge number of smaller lumps of rock and ice also follow their own courses around the Sun - though largely confined in a few relatively crowded zones. Myriad tiny particles flow around all these larger bodies - ranging from fragments of atoms blown out by the Sun to motes of dust and ice left in the wake of comets. Our local corner of the Universe has been studied intensely from the time of the first stargazers to the modern era of space probes, yet it is still a source of wonder and surprise.

 


Sumber : DK Illustrated encyclopedia of the Universe

THE SUN

THE SUN

The hot, incandescent ball of gas that we call the Sun provides Earth with life-sustaining heat and light, and dictates its seasons and climate. But, as awesome as the Sun seems to us, it is a fairly typical star-one of at least 200 billion in the Milky Way Alone.



A TYPICAL STAR
The Sun lies in the disc of the Milky Way, in a region where the average space between stars is about 8 light-years. Like more then 90 percent of all stars, the Sun is in a stable stage of its life. In its hot, dense core, nuclear-fusion reactions convert hydrogen into helium. This releases energy, which gradually makes its way to the surface, where it escapes into space, mostly as infrared radiation (heat) and light. The Sun's rate of energy production and its surface temperature have both stayed relatively constant for about 4.6 billion years-and will stay so for as long again, until the hydrogen runs out. The Sun will then swell into a red giant, increasing its energy output as it burns helium and destroying the inner planets. After ejecting its outer layers, it will end its days as a white dwarf.

SOLAR X-RAY

The bright areas in the X-Ray image show concentrations of hot plasma (ionized gas) in the corona, the Sun's outer atsmospheric layer. The dark patches are coronal holes - regions from which particles stream out and form the solar wind.

THE SUN IN VISIBLE LIGHT
This is sun's surface, or photosphere, as we see it. Although the Sun is gaseous throughout, its density increases so quickly with depth that the disc's edge looks sharp,albeit darker. The spots are cooler regions produced by the Sun's magnetic field.











Sumber : Space