{"id":2387,"date":"2026-03-23T20:00:27","date_gmt":"2026-03-23T20:00:27","guid":{"rendered":"https:\/\/thetab.com\/?p=596025"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"heres-why-the-trip-to-tau-ceti-takes-12-years-but-the-return-is-only-four-in-project-hail-mary","status":"publish","type":"post","link":"https:\/\/thetab.com\/filmshrine\/2026\/03\/23\/heres-why-the-trip-to-tau-ceti-takes-12-years-but-the-return-is-only-four-in-project-hail-mary\/","title":{"rendered":"Here’s why the trip to Tau Ceti takes 12 years but the return is only four in Project Hail Mary"},"content":{"rendered":"

If you watched Project Hail Mary<\/a> and paid attention to the travel times, you might\u2019ve noticed that the trip to Tau Ceti takes over a decade, so why does the return only take about four or five years?<\/p>\n

It sounds like a mistake at first. But actually, there\u2019s a proper scientific explanation behind it, and even the author Andy Weir has addressed it.<\/p>\n

So, in the story, Tau Ceti is around 12 light-years away from Earth. That means, from Earth\u2019s point of view, even travelling close to the speed of light, the journey should take well over a decade. And that\u2019s exactly what happens on the way there.<\/p>\n

But then things get a bit weird on the way back. According to Weir, if Ryan Gosling<\/a>‘s character, Ryland Grace, decided to return to Earth, it wouldn\u2019t feel nearly as long for him. \u201cIt would be between four and five years,\u201d he told Entertainment Weekly<\/a>, talking about the journey from Grace\u2019s perspective.<\/p>\n

So how does that make any sense?<\/h2>\n
\"Project
via Amazon MGM<\/figcaption><\/figure>\n

This is where relativity comes in. Basically, when you travel extremely fast, like close to the speed of light, time doesn\u2019t pass the same way for you as it does for people back on Earth. From Earth\u2019s point of view, the trip still takes something like 11 to 12 years. But for the person on the spaceship, time actually slows down. So, to Grace, the journey feels much shorter.<\/p>\n

But that\u2019s not all. There\u2019s another strange effect going on too. The distance itself sort of \u201cshrinks\u201d from his point of view. So instead of travelling the full 12 light-years, it actually feels like a much shorter distance.<\/p>\n

Interestingly, one person on Reddit<\/a> summed it up in a really simple way. They wrote, \u201cRelativity. It\u2019s really freaky. From Grace\u2019s point of view, it would only take about five years, because it would seem to him that the distance to the Sun is a lot less than 12 light-years. From Earth’s point of view, it’d take well over a decade for the Hail Mary to travel back from Tau Ceti, and if we had good enough telescopes to see Grace moving around through the window, he’d appear to be in slow motion.\u201d<\/p>\n

From Earth, everything is normal, long distance, long time. But from Grace\u2019s perspective, both time and distance are kind of compressed.<\/p>\n

So, the trip to Tau Ceti takes around 12 to 15 years for people on Earth. The trip back is still long for Earth. But for Grace, it only feels like about four or five years. In other words, both things are true at the same time.<\/p>\n

For more like this,\u00a0<\/i>like The Tab on Facebook<\/a><\/i><\/b>.<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"

No, it’s not a plot hole<\/p>\n","protected":false},"author":13,"featured_media":2280,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[34],"tags":[117,4,164,163],"coauthors":[],"class_list":["post-2387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-entertainment","tag-book","tag-film","tag-project-hail-mary","tag-ryan-gosling"],"acf":[],"yoast_head":"\nWhy the trip takes 12 years but return is four in Project Hail Mary<\/title>\n<meta name=\"description\" content=\"Here's the real reason the trip to Tau Ceti takes 12 years but the return is only four in Project Hail Mary.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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