density

Inside the comet 67P found no major voids

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Inside the comet 67P/Churyumov — Gerasimenko there are no large voids. The mission of “Rosetta” the European space Agency made measurements that clearly demonstrated and solved the old mystery. Comets are icy debris left over from the formation of the planets 4.6 billion years ago. Spacecraft have visited a total of eight comets, and through these missions we pulled a picture of the basic properties of these space-time capsules. On some questions the answers were found, others appeared.

Comets, as we know, consist of a mixture of ice and dust, and if there were compact, gravity superior to water. However, previous measurements have shown that some of them have very low density, much lower than water ice. Low density means that the comet must be extremely porous.

But what is this porosity: due to large voids in the subsurface of the comet, or due to a more homogeneous structure with low density? Continue reading

Planets of alien stars

Now we prove the existence of 1783 planets in 1105 planetary systems. And the number of candidates is approaching three thousand. All in all, scientists assume that in our galaxy the milky Way is at least 100 billion exoplanets!

People have long realized that other stars, like the Sun, can have their own planet. And even gave them the name exoplanets or extrasolar planets, i.e. planets outside our Solar system. But to verify the existence of such planets a science was only in the late 1980s. Now it is proved the existence of 1783 planets in 1105 planetary systems. And the number of candidates is approaching three thousand. All in all, scientists assume that in our galaxy the milky Way is at least 100 billion exoplanets. 5-20 billion of them earth-like. Some of the most remarkable exoplanets.

Minitems, that is, exoplanets, which are less in size small even our Earth, Kepler-42 d (also known as KOI-961 d) revolves around the star Kepler-42 in the constellation Cygnus. The radius of the planet is just 0,57 ± 0,18 from the earth’s mass and less than 90 % of the mass of our planet. One year, one revolution around its star, Kepler-42 d lasts for less than 2 earth days. Continue reading

The planet Jupiter

Jupiter, the fifth in distance from the Sun and the largest planet in the Solar system – distance from Sun-5.2 times further than Earth, and spends some turnover on orbit for almost 12 years. Equatorial diameter of Jupiter is 142 600 km (11 times the diameter of the Earth). The period of rotation of Jupiter is the shortest of all the planets – 9 h 50 min 30 s. at the equator and 9 h. 55 min. 40 s. in the mid-latitudes. Thus, the Jupiter, like the Sun, rotates as a rigid body – rotation speed varies in different latitudes. Because of the rapid rotation of this planet has strong compression at the poles. The mass of Jupiter is equal to 318 Earth masses. The average density of 1.33 g/cm3, which is close to the density of the Sun. The rotation axis of Jupiter is nearly perpendicular to the plane of its orbit. Even in a small telescope shows the polar compression of Jupiter and bands on its surface parallel to the equator of the planet

The Structure Of Jupiter

The visible surface of Jupiter is an upper level clouds surrounding the planet. This ensures that all details on the surface of Jupiter is constantly changing its appearance. From sustainable parts known Great Red spot, observed for over 300 years. It is a huge oval formation, the size of about 35,000 km in longitude and 14000 in latitude between the southern tropicheskii southern temperate bands. Continue reading

The structure of comets
Unlike planets, comets move on highly elongated orbits, and therefore are visible only at short periods close to the Sun. The main part of any comet is its nucleus .…

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April 12 - Day of aviation and cosmonautics
On April 12 the whole world celebrates Day of aircraft and Astronautics. This is a special day – a day of triumph of science and all those who are today…

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How long to fly to Mars
The planet Mars is one of the brightest objects in our night sky, even visible to the naked eye and resembles a bright red star. About every two years, our…

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