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What are the sizes of the planets?

A planet differs from a star. The star is a giant ball composed of hot gases, radiant heat and light. The planet is much smaller in size. It emits no light, but rather, is warmed by starlight.

Let’s look at all the planets in order, starting with the one that is closest to the Sun. The nearest planet to Sun — mercury. The diameter of mercury is 4878 kilometers counts, i.e. equal to the Atlantic ocean. And that means mercury is much smaller than Earth.

The next planet is Venus. It’s almost the same size as our Earth. In diameter it has about 12 100 kilometers, and the Earth’s diameter is 12 kilometers 742,5. By the way, Venus rotates around the Sun in the opposite direction, from East to West. For Venus is Earth, then Mars.

Reddish color of the planet Mars has always distinguished it from other heavenly bodies of the Solar system. The diameter of this planet has 6780 miles. This is slightly greater than half the diameter of the Earth. Mars has always attracted the attention of scientists. Because the surface of this planet is visible to any shape, resembling canals. Out of all the planets of the Solar system except our Earth, on Mars it is most likely sushestvovaniya any form of life, maybe vegetable. Continue reading

Space: Science and technology

“It’s huge”

About the discovery of the ninth planet of the Solar system two astronomers from the California Institute of technology in Pasadena became known on January 20. One of them — the native of Russia Konstantin Batygin — spoke about the search for Planet X, the difficulties with the title the new heavenly bodies and unsolved mysteries of the Solar system.

What is an open planet?

Konstantin Batygin . She falls into the category of dwarf planets. This celestial body is quite massive. Our model gives a mass of about ten earth, this planet is just a giant. Now it is defined as a celestial object whose gravitational field is dominant in that part of the Solar system.

In General, there is not even a question: it’s a planet or not. We know about it, because its gravity affects the orbit of the farthest objects in the Kuiper belt. The very mathematical modeling relies on the fact that this planet has enough mass for gravity to dominate in the Solar system. Continue reading

Short-term space flights of man

Manned flights on the orbital stations

In the first decade of the era of manned spaceflight duration increased from 108 min to 18 days. Made in this period, medical and biological research (in the Russian ships “Vostok”, “Voskhod”, “Union”; in the U.S. project “mercury”, “Gemini”, “Apollo”) have proved the possibility of relatively short-term (up to 2-3 weeks) stay safe man in the space flight environment and active activities outside of the ship.

The most significant changes in the major systems of the human body were observed after flights. They were shown to decrease the body’s resistance to physical and orthostatic stress; impaired coordination of movements and regulation of the vertical posture; a reduction of body weight, hydration of the body, decreasing the volume of blood plasma and erythrocyte mass; asthenia. These changes in General increased with increasing duration of space flights and after flights, lasting 14 to 18 days, were practically significant.

Post-flight revealed improvements of indicated that to further increase the duration of flights you need to apply a system of appropriate protective and preventive measures that will facilitate adaptation of the human body to terrestrial conditions after the completion of the flight. Continue reading

NASA will launch a sailing probe to asteroid

The U.S. space Agency plans to launch a probe, equipped with a solar sail. He will leave earth orbit and go to the distant asteroid due to the pressure of sunlight. Like the ships of the discoverers of the 15th century, in 2018, a small space probe will unfurl the sail and start a journey to a faraway asteroid, marking the beginning of a new phase in space exploration.

The idea of using solar sails for space flight was proposed almost a hundred years ago, Soviet rocketry pioneer Friedrich Zander. It was based on the fact that Photons of light can exert pressure on the illuminated surface, giving him his momentum. Therefore, if you expand behind the ship a giant mirror, his speed will gradually increase without using fuel.

However, the first experimental devices were established only at the very end of the twentieth century. This is because space sailboats should be very easy, and their embodiment in life became possible only after the emergence of a truly compact electronics. Continue reading

View from space

5 documentaries about space, which is a must-see after “Gravity”.

Of course, no one claims that the recent release with George Clooney and Sandra bullock is a scientific and educational films. However, in the film there are scenes that require clarification to fully appreciate the realism of the project, Alfonso Cuaron. To do this, we have found 5 documentaries that are not only fascinating but also relevant to the plot of “Gravity.”

“Hubble 3D”, 2010

At the beginning of “Gravity” Dr. Ryan stone, she is new to NASA, trust the repair of Hubble telescope. Learn how the Hubble looks real, how many people have access to it and what happens when damage to a spacecraft, from a picture of Tony Myers. The film “Hubble 3D” is a complete film magazine on a mission “Atlantis”, where the parts are shown in a professional kitchen around Sara and satellites. It is noteworthy that the astronaut Michael Massimino, who was in the space Shuttle Atlantis, is considered the prototype of Matt Kowalski, played by Clooney. The number of celebrities associated with the movie, not the end — in the original version of the film narration reads Leonardo DiCaprio. Continue reading

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Giant spaceships approach the Earth? The recent statement by scientists from SETI (the project engaged in the search for extraterrestrial intelligence) is not a joke stirred the public. Once the…

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Short-term space flights of man
Manned flights on the orbital stations In the first decade of the era of manned spaceflight duration increased from 108 min to 18 days. Made in this period, medical and…

Continue reading →

Comets from the far reaches
Astronomers have determined that comets from the far reaches of our Solar system do not threaten the Earth. The discovery was made after computer modeling of the behavior of these…

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