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Astronomer Avi Loeb, former president of the astronomy department at Harvard UniversityIn United States, wrote an article for the magazine Scientific American where he argues that some stars literally travel in time. According to him, these bodies are close to supermassive black holes in the center of a distant galaxy

These trips can happen for different reasons, the main one being the fact that these stars are ejected by super powerful gravitational fields. Another possibility is massive cosmic explosions, which can cause these stars to be launched by the galaxy in a speed close to that of light. Because of this, it is possible to say that they travel in time in this process.

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Loeb argues that traveling at such a high speed brings a series of unstable physical effects to these stars, in addition to bringing about an effect known as time dilation. This happens when an object travels at high speed and perceives time passing more slowly in relation to a stationary object. 

This effect was exemplified in a mental experiment called the “twin paradox”, where it is proposed that a twin goes on a high-speed space travel. Upon returning to Earth, the brother who traveled is younger than the one who stayed here. 

Both the expansion of time and the contraction of space, which is a similar phenomenon, in which the perceived travel distances change, happen at any speed. However, their effective perception only occurs when a speed as high as that of light is reached. 

Extraterrestrial life

In addition to having held an important position at one of the most prestigious universities in the world, Avi Loeb is also well known for his fascination with extraterrestrial life. In this specific article, the astronomer argues that growing stars can be interstellar destinations for aliens traveling through the universe.

Montage of an extraterrestrial spacecraft over the sky of a city in daylight
Avi Loeb believes that highly technological civilizations stop to watch this “light show”. UFOs / Marko Aliaksandr / Shutterstock

In addition, according to him, these stars can also provide a pyrotechnic show that leaves Copacabana's New Year in the shoes. "Altogether, the galactic nuclei offer launch sites for the fastest habitable platforms that nature offers for free," wrote Loeb. 

"It would not be surprising if advanced technological civilizations chose to migrate towards the galactic centers for the same reason that astronauts and spectators migrate to Cape Canaveral in Florida during the launch of rockets," adds the astronomer. 

With information Futurism 

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