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
Comparative sizes of some well-known space objects
Surely everyone at least once in my life come across another list of natural wonders, which lists the highest mountain, the longest river, the driest and the wettest regions of the Earth and so on. Such records are impressive, but they fade tightly in comparison with the sizes of space objects. Here’s to them we will now see.
Mercury is the smallest planet of terrestrial group. The radius of mercury is 2439,7 + 1,0 km 0,055 Mass of the planet earth. Area 0,147 earth.
Mars is superior in size only to the mercury. The mass of the planet equal to 10.7% of the mass of the Earth. Amount equal to 0.15 volume of the Earth.
Venus is closest to Earth on the indicators. The orbital period of 224.7 earth days. Amount equal 0,857 earth. Weight-0,815 earth.
The ground – fourth in the list of largest after mercury.
Neptune – mass Neptune bigger than Earth at 17.2 times. Continue reading
FLASH model of the Solar system convenient for the development of ideas about the Solar system. IN 2D
On this model You can clearly see and understand what the Solar system. Flash animated model, we can consider the motion of the planets not only in the absolute coordinate system, but in relative.
Top left is the lever to change the speed of rotation of the planets (including negative). Beautifully highlights the important points on this model. You can also turn on the music if you need music background.
The lower left of the moon phase. Helps in clarity.
At top right You can enter a specific date, say a birthday, and to get the position of the planets at the moment. Just below the switch between the months and the constellations, walking on the edge of the circle.
Bottom right switch astronomical systems of perceiving the world. Continue reading