Tag Archives: Universe

NASA’s Webb Delivers Deepest Infrared Image of Universe Yet | NASA

By NASA, July 12, 2022

NASA photo

President Joe Biden unveiled this image of galaxy cluster SMACS 0723, known as Webb’s First Deep Field, during a White House event Monday, July 11.

Webb’s image covers a patch of sky approximately the size of a grain of sand held at arm’s length by someone on the ground – and reveals thousands of galaxies in a tiny sliver of vast universe.

Webb’s sharp near-infrared view brought out faint structures in extremely distant galaxies, offering the most detailed view of the early universe to date. NASA and its partners will release the full series of Webb’s first full-color images and data, known as spectra, Tuesday, July 12, during a live NASA TV broadcast.

Source: NASA’s Webb Delivers Deepest Infrared Image of Universe Yet | NASA

EarthSky | What is time, and why does it move forward?

Posted by EarthSky Voices September 19, 2021 and
By Thomas Kitching, UCL

We think of the universe as having a timeline, a point at which it began, until now. But how much do modern cosmologists really know about time? Image via Alex Mittelmann/ Wikimedia.

A bell-shaped funnel with grid lines on it and ‘Big Bang’ written at the narrow end.

Imagine time running backwards. People would grow younger instead of older and, after a long life of gradual rejuvenation – unlearning everything they know – they would end as a twinkle in their parents’ eyes.

That’s time as represented in a novel by science fiction writer Philip K. Dick but, surprisingly, time’s direction is also an issue that cosmologists are grappling with.

While we take for granted that time has a given direction, physicists don’t: most natural laws are “time reversible” which means they would work just as well if time was defined as running backwards. So why does time always move forward? And will it always do so?

Source: EarthSky | What is time, and why does it move forward?