This produces a different answer, which some sources define as 48 billion light-years in radius. A relativist would use a device such as a meter stick, measuring the distance along that device and then extending it as long as needed. Or should it? "It's a logical way to define distance, but not how a relativist defines distance," Kornreich said. So the radius of the observable universe should be 13.8 billion light-years since light only has that long to reach us. To take a simple example, light from the objects farthest away from us would take approximately 13.8 billion light-years to travel to Earth, taking into account that the very youngest objects would be shrouded because light couldn't carry in the early universe. The first complication is that the universe itself is expanding, and the second complication is that space-time can curve. Thanks to missions like these, we are one step closer to providing a more reliable estimate to that question asked so often: 'How many stars are there in the universe?'" Observable universeĮven if we narrow down the definition to the "observable" universe - what we can see - estimating the number of stars within it requires knowing just how big the universe is. "Combined, these measurements will build an unprecedented picture of the structure and evolution of our galaxy. "Gaia will monitor each of its 1 billion target stars 70 times during a five-year period, precisely charting their positions, distances, movements and changes in brightness," ESA said on its website (opens in new tab). Data from the mission is due to be released in June 2022, according to ESA (opens in new tab). It builds on the previous Hipparchus mission, which precisely located 100,000 stars and also mapped 1 million stars to a lesser precision. Gaia aims to precisely map about 1 billion stars in the Milky Way. Missions such as the Gaia mission, a European Space Agency space probe that launched in 2013, may provide further answers. What is the biggest thing in the universe? Continued abuse of our services will cause your IP address to be blocked indefinitely.How many black holes are there in the universe? Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. If you do not understand what is causing this behavior, please contact us here. If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior.
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