Possibly, comets brought water to Earth
To see exactly what is in the comet, it is necessary to analyse its substance with the help of different high sensitive devices, bringing samples to Earth. But aboard a small spacecraft such devices are difficult to place, because the size of the station Stardust 1,7×0,7×0,7 meters – about the same size as the Desk. How to take a sample of matter, flying from the comet’s nucleus at high speed? Space standards Stardust was moving slowly relative to the comet, about one and a half times slower than fly around the Earth artificial satellites. However, even this speed was several times greater than that of the bullet, the station flew over one second 6 km from the Contact of dust particles with the container of solid material at this speed (more than 20 thousand km/h) would have led to their strongest heating and evaporating. The only way to mildly catch and stop these dust particles, turned out to be a trap made of unique material – aerogel, which was established in 1931, but the big distribution has not received. Continue reading
The planet, which attracts the attention of scientists and astronomers, no less than Mars, is the largest planet in the Solar system and part-time older brother the rest of the planets. because Jupiter formed first after the big Bang, and subsequently helped other planets, including Earth, formed. Scientists say that it is thanks to Jupiter, the globe exactly what it is.
Jupiter is the fifth planet in distance from the Sun, to fly from Earth to Jupiter to take two years. He has 67 satellites, which by its position and rotation resemble a system of planets orbiting around the Sun. One of these satellites is of the greatest interest because of the possibility of the existence on it of life is a satellite of Europe. Jupiter attracts attention not only by its size but by the size of its satellites, because the biggest satellite of the Solar system is a moon of Jupiter (Ganymede) which is covered by lots of craters.
In addition, the largest planet of the Solar system consists of gas and liquid and there is absolutely no solid surface. The gas that makes up a planet by composition resembles the structure of the Sun. Continue reading
Universe – all existing world, and not having borders in time and space. The earth is one of nine planets that revolve around the sun in very similar orbits on circles. Earth is the third planet from the Sun after mercury and Venus, after Earth comes Mars, ending the inner group of planets . different small size and solid surface. Followed by the giant planets of the outer group . consisting of hydrogen and helium-Jupiter, Saturn, Uranus, Neptune and little Pluto. In the interplanetary space sweep the comets and meteoric bodies. Seven of the nine planets have satellites . they just opened more than 50. The Earth satellite – the Moon is large (fifth largest and first with respect to the mass of the planet) and causing tidal movement, covering the whole Earth from the core to the surface.
The sun and its planets are called Solar system . The diameter of the Solar system 12 billion km from the Sun significantly more Land – in 333 thousand times the mass, and 109 times the diameter. The average distance from the earth to the Sun is 149.6 million km is taken as the astronomical unit to measure distances in the Solar system. Continue reading