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Linked universe11/22/2023 ![]() To continue Popinchalk's city analogy, by looking beyond the Milky Way we're asking how many people live in all the cities on Earth. What's the largest planet in the universe? 9 strange, scientific excuses for why humans haven't found aliens yet There may be hundreds of millions of habitable planets in the Milky Way, new study suggests With both transits and radial velocities, astronomers look at the star instead of the planet, looking for little signs of the planet’s presence-dips in the amount of starlight when a planet orbits in front or wiggles in the star’s position from the gravitational tug of a planet, respectively. Scientists have used a couple of different techniques to search for exoplanets, including the transit method used by the Kepler space telescope and the radial velocity method that led to the Nobel Prize-winning discovery of 51 Pegasi b. In order to know what a typical stellar household looks like, astronomers look at our neighbors. It's a lot easier to get an estimate using data like the number of people who live in one home, and the number of homes in the city.Īstronomers estimate that every star has approximately one planet based on observations. ![]() For an exact number, you could try to meet people one by one and count them up, but this is entirely impractical. Popinchalk described determining exoplanet totals like trying to figure out how many people live in your city without an internet search.
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