Pins related to electromagnetic (EM) radiation. #radiation #electromagnetic #spectrum #waves #radio #UV #infrared #IR #visible #light #X-rays #gamma #cosmic…
NASA's Fermi Mission Finds Hints of Gamma-ray Cycle in an Active Galaxy - 11/13/2015 - Fermi observations suggest possible years-long cyclic changes in gamma-ray emission from the blazar PG 1553+113. The graph shows Fermi Large Area Telescope data from August 2008 to July 2015 for gamma rays with energies above 100 million electron volts (MeV). For comparison, visible light ranges between 2 and 3 electron volts. Vertical lines on data points are error bars. Background: One possible...
For the first time, a burst of radio waves hundreds of millions of times more energetic than the sun was caught red-handed as it slammed into the Earth. In recent years, astronomers have retroactively spotted a wacky signature in their data: Every now and then, torrents of energy that last a few thousandths of a second wash over Earth. These so-called "fast radio bursts" (brief bursts of radio waves) are currently on the list of unexplained cosmic phenomena. (artists rendition)
The gamma-ray burst GRB 080319B was so intense that, despite happening halfway across the Universe, it could have been seen briefly with the unaided eye. Astronomers from around the world combined data from ground- and space-based telescopes to conclude that the burst's extraordinary brightness arose from a jet that shot material almost directly towards Earth at almost the speed of light - the difference is only 1 part in 20 000.