Scientists have discovered a planet that could have good conditions for life, and it’s one of the closest known planets to Earth. The planet, called GJ 3378b, is about 25 light years away, which is very close to the galaxy. It is about twice the size of Earth and orbits its star in the Sun’s habitable zone, where temperatures could allow liquid water to exist. The planet also receives about 90% of the sunlight that Earth receives from the Sun. Because of this, astronomers say it is one of the most promising nearby planets in the search for life beyond our solar system.
What did scientists discover about GJ 3378b and why is it important?
The study, published in The Astrophysical Journal titled ‘A revised mass and period for the habitable zone super-Earth GJ 3378 b: A planet straddling the cosmic shoreline’, was led by Paul Robertson, associate professor of astronomy at the University of California, Irvine. The researchers updated earlier measurements and found that the planet’s mass is about 2.3 times that of Earth. They also confirmed that it orbits inside its star’s habitable zone, also known as the Goldilocks zone, where conditions may be suitable for liquid water.“It is one of our nearest cosmic neighbors. Twenty-five light-years seems a very long way, but the galaxy is about 100,000 light-years across, so in that respect it is our next neighbor”, as reported in the New York Post.The team made the discovery using two ground-based instruments: the Habitable-Zone Planet Finder on the Hobby-Eberly Telescope in Texas and the NEID Spectrometer on the WIYN Telescope in Arizona. The research was funded by the National Science Foundation and NASA.
Why is GJ 3378b’s atmosphere so important in the search for life?
Although GJ 3378b looks promising, scientists still don’t know one very important thing, whether it has an atmosphere. Without an atmosphere, it is very unlikely that liquid water could exist on the planet’s surface, greatly reducing the likelihood of life as we know it.The planet is located near what scientists call the cosmic coastline. This is the point where radiation from a star can slowly strip away a planet’s atmosphere. Mars is an example of our own solar system. Scientists believe that its atmosphere was once very dense, but over billions of years, much of it was lost due to radiation.Robertson explained how thin the atmosphere really is by comparing the Earth to an apple. He said that if the Earth were the size of an apple, its atmosphere would be only as thick as the apple’s skin. Even though it is so thin, it is enough to create the pressure necessary for liquid water to exist.
When will scientists know if GJ 3378b can support life?
Scientists say that the answer will take time. At present, there are no space telescopes that can confirm whether GJ 3378b has an atmosphere or not.This work is expected to be performed by NASA’s planned Habitable Worlds Observatory, currently expected to launch in the 2040s. The telescope will be able to take direct images of planets like GJ 3378b and study their atmospheres in detail.If scientists confirm that the planet has an atmosphere, they will look for biosignatures. These are chemicals present in the planet’s atmosphere that can be produced by living organisms.“I think it’s very interesting,” Robertson said, talking about the possibility of discovering signs of life.The discovery also adds GJ 3378b to the growing list of nearby planets that future space telescopes will study. Robertson said scientists are still exploring our nearest cosmic neighborhood, looking for planets around the nearest stars because they are the easiest places to search for signs of life.For now, GJ 3378b remains one of the most exciting nearby planets ever discovered. It is of the right size, located to the right of its constellation and receives about the same amount of energy as Earth does from the Sun. Whether it could actually support life is a question scientists hope to answer in the future.