NASA ‘s Hubble Space Telescope has captured a formation of galaxies that looks like a smiling face, said the US space agency.
On Saturday, it posted an image on its Instagram handle that showed two yellow orbs above an arc of light — painting a smiley face in space.
Asking its followers to find the face, NASA explained that using unprecedented resolution of the Hubble’s camera it was able to locate and study regions of star formation.
The arc of light is a galaxy whose shape has been distorted and stretched as a result of passing a massive gravity source, according to the National Aeronautics and Space Administration.
“The lower, arc-shaped galaxy has the characteristic shape of a galaxy that has been gravitationally lensed — its light has passed near a massive object en route to us, causing it to become distorted and stretched out of shape,” said NASA.
The smiling face is located in the galaxy cluster SDSS J0952+3434, and was shot with the Hubble Space Telescope’s Wide Field Camera 3 (WFC3).
The Hubble telescope returned to normal operations on October 26 after successfully recovering a backup gyroscope replacing a failed in October.
The Milky Way, home to our sun and billions of other stars, merged with another smaller galaxy in a colossal cosmic collision roughly 10 billion years ago, scientists said Monday, based on data from the Gaia space observatory.
The union of the Milky Way and the so-called dwarf galaxy Gaia-Enceladus increased our galaxy’s mass by about a quarter and triggered a period of accelerated star formation lasting about 2 to 4 billion years, the scientists said.
“Yes, indeed it was a pivotal moment,” said astronomer Carme Gallart of Instituto de Astrofisica de Canarias in Spain, lead author of the research published in the journal Nature Astronomy.
Galaxies of all types including the Milky Way began to form relatively soon after the Big Bang explosion that marked the beginning of the universe some 13.8 billion years ago, but were generally smaller than those seen today and were forming stars at a rapid rate. Subsequent galactic mergers were instrumental in configuring galaxies existing now.
High-precision measurements of the position, brightness and distance of around a million stars within 6,500 light years of the sun, obtained by the Gaia space telescope operated by the European Space Agency, helped pinpoint stars present before the merger and those that formed afterward.
Certain stars with higher content of elements other than hydrogen or helium arose in the Milky Way, they found, and others with lower such content originated in Gaia-Enceladus, owing to its smaller mass.
While the merger was dramatic and helped shape what the Milky Way has become, it was not a star-destroying calamity.
“This crash was big in cosmic terms, but if it was happening now, we could probably not even notice at a human or solar system level,” Gallart said.
“The distances between stars in a galaxy are so huge — a galaxy is basically empty space — that the two galaxies intermix, change their global shape, more star formation may happen in one, and maybe the small one stops forming stars.
“But the individual stars in each galaxy don’t collide, don’t really notice the force of the event in a way that affects their individual evolution or the evolution of the planetary systems that may be attached to them,” Gallart said.
The Milky Way, spiral shaped with a central bar-like structure composed of stars, includes 100 to 400 billion stars, including the sun, which formed roughly 4.5 billion years ago, far after the merger. (VOA)