Astronomer Jason Wang of Northwestern University posted something unusual on YouTube: a video of four bright dots orbiting a dark disk at the center.. In fact, these are four planets that orbit a star at a distance of 133.3 light years from Earth, according to Science Alert..

The video is the result of observations that scientists have made over the system for 12 years..

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The star was given the designation HR8799, and its four planets became the first system that scientists were able to directly observe.. Since then, Wang has been monitoring the system continuously, and has created a new timelapse..

" For example, it is not obvious that Jupiter or Mars revolves around our Sun, because we live in the same system and do not see from top to bottom.. Astronomical events either happen too fast or too slow to be captured on video. But this video shows how the planets move on a human time scale.. I hope it will let people enjoy something wonderful,” said Wang..

12 years of observations of the system sped up to a few seconds. The dark disk in the center is a young star 30 million years old, about 1.5 times as massive and 4.9 times as luminous as the Sun..

The mass of the inner planet, HR8799e, is 7.4 times that of Jupiter. It makes a revolution around a star in 45 years and is located at a distance from it, which is 16.25 times the distance between the Earth and the Sun.. Observations have shown that this is a storm baby gas giant.

The planet HR8799d has a mass of 9.1 Jupiters and rotates at a speed of 26.67 astronomical units over a period of revolution of 100 years. HR8799c has 7.8 times the mass of Jupiter, orbits at a distance of 41.4 astronomical units (slightly more than the distance between the Sun and Pluto) and completes a revolution in 190 years. According to researchers, there is water in its atmosphere.

The mass of HR8799b is 5.7 times that of Jupiter, it is at a distance of 71.6 astronomical units from the star and makes a revolution around it in 460 years.

Previously, scientists from the University of Exeter using the Gaia observatory were able to detect a new exoplanet and get a direct image of it.. They found that thermonuclear fusion occurs in the core of the object..