Phobos and Deimos

Published May 10, 2018

Phobos and Deimos

The planet Mars has two small satellites - Phobos and Deimos. Deimos circulates in an orbit distant from the planet by about 23 thousand km, and Phobos moves at a distance of only about 9 thousand km from Mars. The whole history of studying Phobos and Deimos is full of amazing events and fascinating riddles. Judge for yourself: the first mention of the presence of two small...

Asteroid ring

Published May 10, 2018

Asteroid ring

The Asteroid ring of the solar system would have been much easier to study if we had known the past history of asteroids, their origin. However, in this direction, research work is still far from complete. In the last century, one of the discoverers of asteroids, Olbers, hypothesized the origin of the asteroid ring, which for a long time was considered plausible...

Green beam

Published May 10, 2018

Green beam

On a clear evening, when the Sun descends beyond the horizon, one can observe one of the most beautiful and unusual phenomena of nature - the green beam. At the moment when the disk of the Sun is hiding, the last sunbeam for a moment becomes bright green. The green beam - the so-called flash on the Sun - sometimes happens in blue...

Solar wind

Published May 10, 2018

Solar wind

The concept solar wind was introduced into astronomy in the late 40s of the 20th century, when the American astronomer S. Forbush, measuring the intensity of cosmic rays, noticed that it decreases significantly with increasing solar activity and quite falls sharply during magnetic storms. This seemed rather strange. Rather, you could expect the opposite. After all, the Sun itself is the supplier of cosmic rays...

The universe shrinks...?

Published May 10, 2018

The universe shrinks...?

We already know that our universe is expanding. However, the equations of the theory of relativity also allow another possibility - compression. Does it matter that the Universe is expanding rather than shrinking? Let's imagine that our universe is shrinking. What will change in this in the picture of the world around us?..

Spacecraft and Earth's gravity

Published May 10, 2018

Spacecraft and Earth's gravity

Spacecraft must be accelerated by a rocket engine to overcome the Earth's gravity. Is it possible to use for this not an engine, but... the very attraction of the Earth? It turns out that in one case such an option is possible. The thing is that in calculating the motion of a spacecraft, it is usually taken for a material point...

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