For thousands of years, astronomers have watched Halley\u2019s Comet come and go, becoming visible to the naked eye every 72 to 80 years. That makes it a short-period comet, whose highly elliptical orbit takes it beyond Neptune before making its decades-long return. (The last time we caught a glimpse of the comet was in 1986, while its next appearance is slated for mid-2061.)<\/p>\n
Other comets take far longer to orbit the Sun. As the New York Times reports<\/a>, comet C\/2025 R3 PANSTARRS, which was only discovered last year, has been visible to stargazers in the northern hemisphere for weeks now. However, once it\u2019s on its way out, it\u2019s not expected to return for another 170,000 years<\/a>.<\/p>\n It\u2019s origin is of particular interest to astronomers, who believe it came from the Oort Cloud, a giant spherical shell that blankets the solar system, representing the outermost edge of our star\u2019s gravitational influence. Researchers believe it\u2019s chock full of icy and rocky objects like C\/2025 R3 PANSTARRS.<\/p>\n Long-period comets are an exceedingly rare sight \u2014 and an exciting opportunity to get a precious glimpse of the furthest reaches of the solar system.<\/p>\n \u201cWhenever we spot them, it\u2019s the first time we\u2019ve seen them, and it\u2019s also the only time that we will see them in our lifetimes,\u201d Te Whatu Stardome in New Zealand resident astronomer Josh Aoraki told the NYT.<\/p>\n Whether future civilizations will be able to see the visitor again isn\u2019t guaranteed. As the Perth Observatory\u2019s Matt Woods points out<\/a> in a recent guide, gravitational interactions with the solar system\u2019s planets can eject comets form our star system altogether.<\/p>\n Given its suspected origins, studying a \u201cdirty snowball\u201d comet like C\/2025 R3 PANSTARRS could provide us with tantalizing clues about the earliest days of the solar system. Current theories<\/a> suggest that tiny chunks of leftover planet-making material dating back billions of years, called planetesimals, were driven away from the Sun when the planets formed. While some left the system entirely, others were trapped between a region where galactic influences balanced out with the Sun\u2019s gravity, a region that\u2019s now known as the Oort cloud.<\/p>\n The movement of these objects may have even played a role in delivering the necessary building blocks that allowed life on Earth to form, according to Woods.<\/p>\n In other words, there are plenty of reasons to get out the telescope before C\/2025 R3 PANSTARRS is too distant to be visible to amateur astronomers.<\/p>\n \u201cSo while C\/2025 R3 PANSTARRS might appear as little more than a faint, fuzzy patch through binoculars, it represents something far more significant,\u201d Woods wrote. \u201cIt is a relic from the birth of the Solar System, a frozen archive of cosmic history, and for a brief moment, it\u2019s visible from right here on Earth.\u201d<\/p>\n \u201cNot bad for something you can spot just after sunset,\u201d he added.<\/p>\n