Neutrinos seemingly aren’t slowed by ‘spacetime foam’ | Science News

Real Science. Real News.

Science News is a nonprofit.

Support us by subscribing now.

News in Brief

One particle’s trek suggests that ‘spacetime foam’ doesn’t slow neutrinos

The nearly massless particles appear to travel at virtually the speed of light

7:00am, July 19, 2018
an illustration of a neutron being blasted from a blazar

SPEED TEST  A neutrino blasted from a bright galaxy known as a blazar (illustrated) along with a flare of light reveals that neutrinos travel at roughly the speed of light.  

An intergalactic race between light and a bizarre subatomic particle called a neutrino has ended in a draw.

The tie suggests that high-energy neutrinos, which are so lightweight they behave as if they’re massless, adhere to a basic rule of physics: Massless particles travel at the speed of light.

Comparing the arrival times of a neutrino and an associated blaze of high-energy light emitted from a bright, flaring galaxy (SN Online: 7/12/18) showed that the neutrino and light differed in speed by less than a billionth of a percent, physicists report in a paper posted July 13 at

Massless particles — including the particles of light known as photons — consistently move about 300,000 kilometers per second, while massive particles move more slowly. Although neutrinos have mass, their heft is so

This article is only available to Science News subscribers. Already a subscriber? Log in now.
Or subscribe today for full access.

Get Science News headlines by e-mail.

More on 2018 Top 10

From the Nature Index Paid Content