One of the main themes of this blog is “What’s changed in the last 50 years?” — as far as our understanding of physics and the cosmos. For this post, let’s consider the last 100 years or so. There have been major changes in our cosmic perspective. Rather than adding the content of this post as a comment for a previous one on the topic (see notes), I decided that this video visualization merits its own post.
This retrospective on the SpaceRip YouTube channel contains wonderful visuals. Many comments praise the narration. The video takes us from the days of an island universe into the quest to understand distant incredibly powerful gamma ray bursts. In particular, the role that the Swift Gamma-Ray Burst space telescope (now called the Neil Gehrels Swift Observatory) has played in that understanding.
There have been times when our understanding of the universe has reached a standstill — when our grasp of the workings of time and space, the nature of matter and energy do not fully square with what we observe. In those times, opposing world views cannot be resolved. So it was in the spring of 1920 when astronomers debated the scale of the universe …
September 13th 2008, the Swift satellite recorded a burst with the power of 9000 supernovae and a jet that was clocked at 99.9999% the speed of light.
April 29th 2009, brought the second most distant object ever recorded. The journey of this gamma-ray burst started 13.14 billion years ago.
Astronomers have begun to see these beacons as probes for understanding the chemical evolution of the cosmos going all the way back to when stars and galaxies were just beginning to form. But how does nature produce a beacon of light that can reach across the entire breadth of the visible universe? One team of scientists has been looking for answers close to home in a giant galaxy some 50 million light years away known as M87.