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American Focus > Blog > Tech and Science > Earth-Like Planet Discovered Orbiting an Alien Star. There’s Just One Big Problem. : ScienceAlert
Tech and Science

Earth-Like Planet Discovered Orbiting an Alien Star. There’s Just One Big Problem. : ScienceAlert

Last updated: September 26, 2024 10:08 am
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Earth-Like Planet Discovered Orbiting an Alien Star. There’s Just One Big Problem. : ScienceAlert
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The quest for a second Earth in the Milky Way galaxy continues, but a recent discovery has shed light on the potential fate of our own planet. The newly found exoplanet, with a mass 1.9 times that of Earth, orbits a white dwarf star at double the distance of Earth from the Sun. This star, in its final stages of evolution, provides a glimpse into what may happen to our Solar System when the Sun reaches the end of its life cycle.

Led by astronomer Keming Zhang of the University of California, the discovery showcases the use of microlensing to locate Earth-like worlds that are challenging to detect. White dwarfs are what stars like the Sun transform into as they run out of fuel and undergo a red giant phase before collapsing into a dense core. This process results in the star expelling its outer material and forming a white dwarf that emits residual heat.

The red giant phase can cause the star to expand to hundreds of times its original size, potentially engulfing nearby planets. However, the discovery of an Earth-like exoplanet surviving around a white dwarf suggests that survival is possible. The system was detected through a microlensing event, where the gravitational field of the white dwarf magnified the light from a distant star.

This rare event allowed researchers to determine the mass and orbital separation of the exoplanet, as well as the presence of a brown dwarf orbiting the white dwarf. The brown dwarf, larger than a planet but not massive enough to sustain hydrogen fusion, provides insights into the system’s evolution. The current orbit of the exoplanet suggests it was once closer to the white dwarf, similar to Earth’s distance from the Sun.

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As the Sun transitions into a red giant, the habitable zone will shift, potentially making moons around gas giants like Jupiter and Saturn viable for human settlement. Zhang envisions a future where humanity migrates to these ocean planets as Earth undergoes drastic changes. The study has been published in Nature Astronomy, highlighting the significance of understanding the evolution of stars and their planetary systems.

In conclusion, while the discovery of the Earth-like exoplanet orbiting a white dwarf may not be the second Earth we seek, it offers valuable insights into the future of our own planet. By studying these distant worlds, we may uncover clues to our own Solar System’s destiny and the possibilities for life beyond Earth.

TAGGED:AlienbigDiscoveredEarthLikeOrbitingPlanetproblemScienceAlertstar
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