How Can Space Travel Faster Than The Speed Of Light?

Light speed is often spoken of as a cosmic speed limit … but not everything plays by these rules. In fact, space itself can expand faster than a photon could ever hope to travel. » 2/22/15 10:35am 2/22/15 10:35am

How To Test Einstein's "Twin Paradox" Without Using A Spaceship

Einstein said that clocks that are moving through space at dramatically divergent speeds will measure time differently, and he used his famous "twin paradox" to illustrate the point. But there are easier ways to show that time dilation is real. » 4/16/14 3:20pm 4/16/14 3:20pm

Lightspeed Presents… “The Infill Trait” by C.C.Finlay

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Infill Trait" by C.C.Finlay. Enjoy! » 2/05/13 4:53pm 2/05/13 4:53pm

This is what it would really look like to travel at near-lightspeed

It's one of the most iconic images in all of science fiction: the stretching of stars as a ship makes the jump to lightspeed. But as a group of physics students at the University of Leicester has revealed, it wouldn't actually look like this. Instead, and assuming a ship could travel at nearly the speed of light, a… » 1/15/13 8:00am 1/15/13 8:00am

Lightspeed Presents… “The Sounds of Old Earth” by Matthew Kressel

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Sounds of Old Earth" by Matthew Kressel. Enjoy!
The Sounds of Old Earth
Matthew Kressel » 1/01/13 10:30am 1/01/13 10:30am

The thought experiment that proved light has a speed limit

It took a lot of careful and detailed measurement to prove that the speed of light doesn't change. But it also took one important thought experiment. The de Sitter Effect showed us how stars would look if light didn't have a speed limit. » 12/20/12 9:00am 12/20/12 9:00am

Lightspeed Presents… “The Perfect Match” by Ken Liu

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Perfect Match" by Ken Liu. Enjoy! » 12/06/12 2:36pm 12/06/12 2:36pm

Lightspeed Presents… “Flowing Unimpeded to the Enlightenment” by Robert…

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "Flowing Unimpeded to the Enlightenment" by Robert Reed. Enjoy! » 10/09/12 3:00pm 10/09/12 3:00pm

Lightspeed Presents . . . "My Wife Hates Time Travel" by Adam-Troy…

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is " My Wife Hates Time Travel " by Adam-Troy Castro. Enjoy! » 9/07/12 11:20am 9/07/12 11:20am

Lightspeed Presents . . . "The Bookmaking Habits of Select Species," by…

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Bookmaking Habits of Select Species" by Ken Liu. Enjoy! » 8/07/12 3:32pm 8/07/12 3:32pm

Lightspeed Presents... “Requiem in the Key of Prose” by Jake Kerr

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "Requiem in the Key of Prose" by Jake Kerr. Enjoy! » 7/03/12 10:20am 7/03/12 10:20am

Lightspeed Presents... "The Cristóbal Effect" by Simon McCaffery

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Cristóbal Effect" by Simon McCaffery. Enjoy! » 6/05/12 6:30am 6/05/12 6:30am

Lightspeed Presents... "Nightside on Callisto" by Linda Nagata

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "Nightside on Callisto" by Linda Nagata. Enjoy! » 5/03/12 6:30am 5/03/12 6:30am

Lightspeed Presents... "Ruminations in an Alien Tongue" by Vandana Singh

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "Ruminations in an Alien Tongue" by Vandana Singh. Enjoy! » 4/03/12 10:30am 4/03/12 10:30am

Lightspeed Presents... "The Day They Came" by Kali Wallace

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "The Day They Came" by Kali Wallace. Enjoy! » 3/09/12 7:01pm 3/09/12 7:01pm

Lightspeed Presents... "Her Words Like Hunting Vixens Spring" by Brooke…

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. This month's selection is "Her Words Like Hunting Vixens Spring " by Brooke Bolander. Enjoy! » 2/07/12 3:20pm 2/07/12 3:20pm

Lightspeed Presents... "How Many Miles to Babylon?" by Megan Arkenberg

io9 is proud to present fiction from Lightspeed Magazine. Once a month, we'll be featuring a story from Lightspeed's current issue. Here's our first selection, "How Many Miles to Babylon?" by Megan Arkenberg. Enjoy! » 1/03/12 10:59am 1/03/12 10:59am

An art colony in Montana that's haunted by aliens

Lightspeed recently republished a classic story by Carolyn Ives Gilman, "Frost Painting," about a mysterious art colony in Montana that the locals say is inhabited by aliens — or maybe humans who have become alien. It's also the tragic, wistful story of an art critic who falls in love with an artist whose greatest… » 6/17/11 2:41pm 6/17/11 2:41pm

It's launch day for new science fiction magazine Lightspeed

Indie SF publisher Prime Books is publishing a new online magazine of science fiction and essays called Lightspeed. Edited by John Joseph Adams, formerly of Fantasy & Science Fiction, Lightspeed aims to "push the envelope." Now you can read it! » 6/01/10 3:05pm 6/01/10 3:05pm

Disney throws loads of cash at Bruckheimer's space race picture,…

Jerry Bruckheimer and Disney just paid a pretty penny for the new space race screenplay from Bruckheimer's usual writers. Which means we're due for a epic space film that may not be groundbreaking, but by god it will be entertaining. » 5/25/10 1:13pm 5/25/10 1:13pm