https://padlet.com/1803999/fiei8ujypvpa Johnson Per. 5 en-us 2019-04-01 17:36:49 UTC 2019-04-12 16:24:00 UTC hello@padlet.com 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/347735907 After a massive star well beyond the size of our sun collapsed exploded, remnants of the star were hurled into space. Over a period of time, the material began to cluster together to form brilliant spirals of colorful debris. All that is left of the original star are these bright clusters of star-dust and a small neutron star at the center of the cloud cluster.]]> 2019-04-02 17:08:11 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/347735907 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/347747037 The light from Cassiopeia first reach Earth about 300-350 years ago, sometime in the mid to late 1600s. With this estimate, that would make Cassiopeia A the youngest supernova remnant in the Milky Way Galaxy]]> 2019-04-02 17:29:02 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/347747037 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/347750587 2019-04-02 17:35:44 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/347750587 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/347752681 Because Cassiopeia A is the strongest source of radio emissions outside of our solar system, a far amount of research has gone into it]]> 2019-04-02 17:39:44 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/347752681 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350470113 Because of the strong radio waves, Cassiopeia A was the subject of many early astronomers' research into the sources of EMS radiation in space]]> 2019-04-10 17:26:37 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350470113 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350472249 It is surprising to learn that the stunning pictures of Cas A are not actually how it looks in reality. Many of the pictures use false color to represent invisible waves, such a radio waves and x-rays. In reality, Cassiopeia A is nearly invisible to the naked eye]]> 2019-04-10 17:30:32 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350472249 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350474949 2019-04-10 17:35:25 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350474949 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350475674 2019-04-10 17:36:58 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350475674 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350475759 0:45 seconds]]> 2019-04-10 17:37:07 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350475759 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/350975331 2019-04-11 21:17:19 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/350975331 1803999 https://padlet.com/1803999/fiei8ujypvpa/wish/351219741 2019-04-12 16:19:25 UTC https://padlet.com/1803999/fiei8ujypvpa/wish/351219741