This computer-generated view depicts part of Mars at the boundary between darkness and daylight, with an area including Gale Crater beginning to catch morning light, in this handout image provided by NASA. It may not be space debris, errant asteroids, supply shortages, thruster malfunctions or even the malevolent aliens envisioned in so many Hollywood films that thwart astronauts on any mission to Mars. It may be the ubiquitous galactic cosmic rays. Researchers said on May 1, 2015 long-term exposure to these rays that permeate space may cause dementia-like cognitive impairments in astronauts during any future round-trip Mars trip, expected to take at least 2-1/2 years. Reuters/NASA/JPL-Caltech/Handout

A warning to turn off mobile phones that first spread in blog posts in 2008 is being resurrected. In late 2012, it resurfaced in emails, text messages and social media posts, and again reared its ugly head at the start of 2016.

The warning explains the need to shut off cellphones from 12:30 to 3:30 am because of alleged cosmic rays from Mars that would enter Earth, reports Wafflesatnoon, a Web site dedicated to debunking Internet rumours and hoaxes. The warning, to give it an appearance of coming from authorities, cites the National Aeronautics and Space Administration (NASA) as the source, coursed through BBC.

From mid-2012 until January 2016, it kept resurfacing every four months. To belie the recurring lie, the Web site cites six reasons why there is no need to shut off all mobile phones for three hours.

One reason is that planets do not emit cosmic rays. Even if the Red Planet could reflect cosmic rays, it would not be of significant intensity or result in surges as warned. The Earth’s atmosphere likewise has protection against most cosmic rays. The rays would only affect phones would be if it impacts satellite communications, but not on the device itself or the gadget’s batteries.

According to the Pierre Auger Observatory, lower-energy cosmic rays that strike the Earth comes from the Milky Way Galaxy, possibly originating “directly or indirectly, from the supernova icon info explosions that mark the deaths of many stars.”

The Washington Post adds that coronal mass ejections and solar flares are abating in 2016 since the year would likely just follow the footsteps of 2015 when there were just a few days of solar significance, mainly occasional surges. Expected recurrent solar wind stream, which could be forecast days to weeks ahead, would result in minor to moderate geomagnetic storming caused by the repetitive pulses.

The daily adds that solar radiation storms would be extremely rare in 2016, but the galactic cosmic ray (GCR) flux would be on the rise. NASA recognises the GCR’s huge problem, but only for astronauts flying to Mars, not earthlings staying put in the planet.