Sharing your best photo showing a detail of Earth on social media with #PictureEarth on Earth Day on April 22, can win you a chance to get that photo featured in NASA videos or composite images.
“We’ll check Instagram, Twitter and our NASA Earth Facebook event page to find your images and select photos from around the world to showcase later in videos and composite images,” NASA said in a statement on Friday.
“Be sure to tell us where your photo was taken in the text of your social media post,” the US space agency added.
To be considered for the NASA videos and composite images, people can post a close-up photo on social media of their favourite natural features, such as crashing waves, ancient trees, blooming flowers, or stunning sunsets.
You need to use the hashtag #PictureEarth and upload the photo on April 22. (IANS)
NASA has detected a massive thermonuclear explosion coming from outer space, caused by a massive thermonuclear flash on the surface of a pulsar — the crushed remains of a star that long ago exploded as a supernova.
The explosion released as much energy in 20 seconds as the Sun does in nearly 10 days.
NASA’s Neutron Star Interior Composition Explorer (NICER) telescope on the International Space Station (ISS) detected a sudden spike of X-rays on August 20, reports the US space agency.
The X-ray burst, the brightest seen by NICER so far, came from an object named “J1808”.
The observations reveal many phenomena that have never been seen together in a single burst.
In addition, the subsiding fireball briefly brightened again for reasons astronomers cannot yet explain.
“This burst was outstanding. We see a two-step change in brightness, which we think is caused by the ejection of separate layers from the pulsar surface, and other features that will help us decode the physics of these powerful events,” said lead researcher Peter Bult, an astrophysicist at NASA’s Goddard Space Flight Center in Maryland.
The detail NICER captured on this record-setting eruption will help astronomers fine-tune their understanding of the physical processes driving the thermonuclear flare-ups of it and other bursting pulsars.
“J1808” is located about 11,000 light-years away in the constellation Sagittarius.
It spins at a dizzying 401 rotations each second, and is one member of a binary system. Its companion is a brown dwarf, an object larger than a giant planet yet too small to be a star. A steady stream of hydrogen gas flows from the companion toward the neutron star, and it accumulates in a vast storage structure called an accretion disk.
Astronomers employ a concept called the “Eddington limit”, named after English astrophysicist Sir Arthur Eddington, to describe the maximum radiation intensity a star can have before that radiation causes the star to expand.
This point depends strongly on the composition of the material lying above the emission source.
“Our study exploits this longstanding concept in a new way,” said co-author Deepto Chakrabarty, a professor of physics at MIT.
“We are apparently seeing the Eddington limit for two different compositions in the same X-ray burst. This is a very powerful and direct way of following the nuclear burning reactions that underlie the event.”