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What is the big crunch'?
Scientists believe that the universe is expanding and galaxies are moving apart. If the gravity of all cosmic material restrained the outward push enough.
the expansion could stop. and the universe could begin to contract. This could mean either the end of the universe in a "big bang in reverse, or an endless series of expansions and contractions (a pulsating universe). The possible finale to a contracting universe when all the galaxies smash together is known as the 'big crunch.
Why do some planets have rings?
The rings around some planets have presented astronomers with a major puzzle for centuries
Christiaan Huygens. the Dutch mathematician and physicist, who invented the pendulum clock. studied Saturn with a powerful telescope and said that the planet was surrounded by a flat ring, which encircled it at its equator. In 1665. a French-Italian astronomer, by name Gian Domenico Cassini, noticed that there were two rings, one inside another This is still known as the Cassini division.
Saturn's rings shine more brightly than the planet itsell. The rings are gigantic, stretching some 272000 km, which is more than twenty times the diameter of the Earth. Voyager probes have sent back a mass of a data about the rings surrounding the distant gas giants, but there have not been any convincing explanation for the formation of the rings.
One theory is that the rings are formed when a moon or perhaps an icy comet, comes too close to a large planet and gets torn apart by gravity. As the pieces break away. they go into independent orbits around the planet. and through constant collisions eventually become clouds of fine dust and gas. This theory is supported by the fact that only the largest planets, with the strongest gravity have rings.
Another theory states that the rings were formed in the earliest days of the solar system from the same materials that made up the planets. For a time, the large planets might have resembled a flattened disk of gas and dust. Gravity pulled the more solid material into smaller space, and eventually condensed it into a planet and the remaining dust and gas tightened into the ring system that we see today.
Planet facts:
The largest planet: Jupiter (Equatorial diameter: 142,880 kilometres)
The smallest planet: Pluto (Diameter - 3,000 kilometer)
The brightest planet: Venus
The hottest planet: Venus (Surface temperature:462° C)
The coldest planet: Pluto (Surface temperature-214° C)
The fastest planet. Mercury (Average orbital speed: 172,248 kilometre per hour)
Scientists believe that the universe is expanding and galaxies are moving apart. If the gravity of all cosmic material restrained the outward push enough.
the expansion could stop. and the universe could begin to contract. This could mean either the end of the universe in a "big bang in reverse, or an endless series of expansions and contractions (a pulsating universe). The possible finale to a contracting universe when all the galaxies smash together is known as the 'big crunch.
Why do some planets have rings?
The rings around some planets have presented astronomers with a major puzzle for centuries
Christiaan Huygens. the Dutch mathematician and physicist, who invented the pendulum clock. studied Saturn with a powerful telescope and said that the planet was surrounded by a flat ring, which encircled it at its equator. In 1665. a French-Italian astronomer, by name Gian Domenico Cassini, noticed that there were two rings, one inside another This is still known as the Cassini division.
Saturn's rings shine more brightly than the planet itsell. The rings are gigantic, stretching some 272000 km, which is more than twenty times the diameter of the Earth. Voyager probes have sent back a mass of a data about the rings surrounding the distant gas giants, but there have not been any convincing explanation for the formation of the rings.
One theory is that the rings are formed when a moon or perhaps an icy comet, comes too close to a large planet and gets torn apart by gravity. As the pieces break away. they go into independent orbits around the planet. and through constant collisions eventually become clouds of fine dust and gas. This theory is supported by the fact that only the largest planets, with the strongest gravity have rings.
Another theory states that the rings were formed in the earliest days of the solar system from the same materials that made up the planets. For a time, the large planets might have resembled a flattened disk of gas and dust. Gravity pulled the more solid material into smaller space, and eventually condensed it into a planet and the remaining dust and gas tightened into the ring system that we see today.
Planet facts:
The largest planet: Jupiter (Equatorial diameter: 142,880 kilometres)
The smallest planet: Pluto (Diameter - 3,000 kilometer)
The brightest planet: Venus
The hottest planet: Venus (Surface temperature:462° C)
The coldest planet: Pluto (Surface temperature-214° C)
The fastest planet. Mercury (Average orbital speed: 172,248 kilometre per hour)
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