Wednesday July 18, 2018
Home Uncategorized Sit tight, Ju...

Sit tight, June will last one second longer

0
//
46
Republish
Reprint

earth

 

By NewsGram Staff Writer

People born on June 30 will be able to celebrate their birthday for one second longer this time. Due to the Earth’s rotation, the month will last one second more than a normal day. The midnight Coordinated Universal Time on June 30 will read 23:59:60 rather than resetting to 00:00:00, according to Discover Magazine.

The extra second, or “leap second,” is needed to re-synchronise our land-based clocks with Earth’s rotation, which is slowing down ever so slightly each year, it said. This is the 26th time a second has been added to the day since the practice began in 1972. Due to tidal forces between the Earth and the Moon, our planet’s rotation is slowing down, adding a whopping 1.4 milliseconds to our days every century.

During the time of the dinosaurs, the typical day on Earth was just 23 hours. In fact, the last true 24-hour rotation, exactly 86,400 seconds, occurred in 1820. Since then, the day has lengthened by 2.5 milliseconds, according to NASA. Earth has seen these precise measurements, thanks to punctual NASA scientists who have been monitoring the planet’s rotation using a technique called Very Long Baseline Interferometry (VLBI), the report said.

The last leap second, in 2012, caused a mayhem on popular websites with clocks synced to standard civil time. In a bid to avoid this, Google added a millisecond of time to their servers with each update so they were caught up with the new time when the leap second occurred.

(With inputs from IANS)

Click here for reuse options!
Copyright 2015 NewsGram

Next Story

Superstar Eta Carinae’s Cosmic Rays May Reach Earth: Study

Astronomers know that cosmic rays with energies greater than one billion electron volts (eV) come to us from beyond our solar system.

0
Superstar Eta Carinae's Cosmic Rays May Reach Earth: Study
Superstar Eta Carinae's Cosmic Rays May Reach Earth: Study. Pixabay

Eta Carinae, the most luminous and massive stellar system within 10,000 light years, is accelerating particles to speeds comparable to that of light — some of which may reach Earth as cosmic rays, suggests a new study.

“We know the blast waves of exploded stars can accelerate cosmic ray particles to speeds comparable to that of light, an incredible energy boost,” said the lead author of the study Kenji Hamaguchi, an astrophysicist at NASA’s Goddard Space Flight Centre in Greenbelt, Maryland.

“Similar processes must occur in other extreme environments. Our analysis indicates Eta Carinae is one of them,” Hamaguchi said.

Astronomers know that cosmic rays with energies greater than one billion electron volts (eV) come to us from beyond our solar system.

But because these particles — electrons, protons and atomic nuclei — all carry an electrical charge, they veer off course whenever they encounter magnetic fields. This scrambles their paths and masks their origins.

For this study, published in the journal Nature Astronomy, the researchers used data from NASA’s NuSTAR space telescope.

Launched in 2012, NuSTAR can focus X-rays of much greater energy than any previous telescope.

Using both newly taken and archival data, the team examined NuSTAR observations acquired between March 2014 and June 2016, along with lower-energy X-ray observations from the European Space Agency’s XMM-Newton satellite over the same period.

“We’ve known for some time that the region around Eta Carinae is the source of energetic emission in high-energy X-rays and gamma rays,” said Fiona Harrison, the principal investigator of NuSTAR.

Carina Nebula
Carina Nebula. Pixabay

“But until NuSTAR was able to pinpoint the radiation, show it comes from the binary and study its properties in detail, the origin was mysterious,” said Harrison, who also serves as a professor of astronomy at California Institute of Technology (Caltech) in Pasadena.

Eta Carinae, located about 7,500 light-years away in the southern constellation of Carina, is famous for a 19th century outburst that briefly made it the second-brightest star in the sky.

This event also ejected a massive hourglass-shaped nebula, but the cause of the eruption remains poorly understood.

The system contains a pair of massive stars whose eccentric orbits bring them unusually close every 5.5 years.

Also read: Brain Damage Caused by Cosmic Rays Can be Prevented With this Drug

The stars contain 90 and 30 times the mass of our Sun and pass 225 million km apart at their closest approach — about the average distance separating Mars and the Sun. (IANS)

Next Story