Newly Discovered Planet at the Edge of the Galaxy

Astronomers have identified a peculiar planet at the outskirts of our galaxy, utilizing methods that echo theories proposed by Albert Einstein. The planet, named AT2021UEY B, is a gas giant comparable in size to Jupiter and sits about 3,200 light years away from Earth. According to research published in the Journal Astronomy & Astrophysics, it takes approximately 4,170 days for AT2021UEY B to orbit its dwarf star.

Live Science reports that the shadow of AT2021UEY B was initially observed in 2021 through data collected by the European Space Agency’s Gaia Telescope. Astronomers needed several observations to fully capture the planet’s characteristics.

The discovery was made using a technique called microlensing, a method that has only been employed a few times in the past.

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Microlensing, based on Einstein’s theory of relativity, demonstrates how massive objects can bend the fabric of space-time as they travel through the galaxy. Dr. Marius Maskoliunas, an astronomer from Vilnius University and co-author of the study, shared insights regarding this research with Phys.org. He mentioned, “This kind of work requires a lot of expertise, patience, and, frankly, a little luck. You’ll have to wait a long time to sift through the vast amount of data once the source star and lensing objects align.” Maskoliunas emphasized that about 90% of the observed stars pulsate for various reasons, making microlensing effects fairly rare.

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According to the study, microlensing occurs when large objects are perfectly positioned in front of more distant stars. As AT2021UEY B moves across the sky, its presence causes light to bend around it, enhancing the brightness of the background stars temporarily. This phenomenon is the key signal that astronomers seek.

Maskoliunas offered an analogy to clarify the concept of microlensing. He explained, “It’s like noticing shadows of birds flying past you without seeing the birds themselves. You might not know their color, but you can still infer their presence.” He added, “Eventually, we can make educated guesses about what type of birds they might be, even from a distance. It’s a fascinating process.”

Since 1992, nearly 6,000 planets have been identified using more conventional methods, such as photometric and radial velocity techniques. These methods detect planets by observing the dimming of the host stars or the gravitational wobble they induce.