This is one of the questions I get asked quite often. And very often it is asked in roughly the following form: Light from a distant galaxy has been coming to us for several billion years. …

In 1969, mankind conquered one of its highest achievements-the first time a human foot set foot on the surface of another celestial body. In this article I will not again refute the “lunar conspiracy” theory. I have already done it in two articles: (first and second) and I don’t see…

At the moment, our ability to deliver cargo to orbit is severely limited by the high cost of launch. However, work is underway everywhere to make space launches cheaper. Rocketless launch methods such as space elevator, bridge, cannon, etc. are being developed. When people can deliver construction materials to orbit…

Comet 46P/Wirtanen is now quite visible from Earth even with the naked eye and is all the more accessible to observation through amateur telescopes. In connection with this many people have questions, why in photos taken by amateur astronomers a comet is green, but in the Hubble telescope photo it…

There is currently no alternative to rockets for getting cargo into orbit. However, it is incredibly expensive to launch rockets. Even now that SpaceX has developed ways to reuse the first stages of rockets still costs tens of millions of dollars per rocket launch, and the cost of delivering 1…

Abiogenesis is the process by which living matter arose from non-living matter. According to modern scientific thinking, life on Earth arose spontaneously through natural processes sometimes called chemical evolution. The idea is that prior to the emergence of life, inorganic compounds dominated the earth. Natural processes began to produce more…

A few days ago I was sent the following question: Why can’t we see the center of our galaxy in the night sky? The center as a brighter point or a large prominent area? If we see individual stars, we see what appear to be stars, individual galaxies; why from…

I am sometimes asked about the ways to create artificial gravity on spacecraft, and I am also often asked why the international space station has not yet created artificial gravity. Let’s get to the bottom of these questions. Ways to create artificial gravity Rotation around one’s own axis. In this case, the effect of gravity is created by the centrifugal…

This is a question I am quite often asked by people far removed from the sciences of space. I quite honestly (and correctly) answer that no, the Earth does not have another natural satellite. To which I am usually exclaimed: But what about Cruithne? (The questioner usually looks very smug…