MSGID: 1:153/757.0 b797fa79
TZUTC: -0700
CHRS: LATIN-1 2
                        Astronomy Picture of the Day

    Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                               2024 August 23

                           Supernova Remnant CTA 1
                    Image Credit & Copyright: Thomas Lelu

   Explanation: There is a quiet pulsar at the heart of CTA 1. The
   supernova remnant was discovered as a source of emission at radio
   wavelengths by astronomers in 1960 and since identified as the result
   of the death explosion of a massive star. But no radio pulses were
   detected from the expected pulsar, the rotating neutron star remnant of
   the massive star's collapsed core. Seen about 10,000 years after the
   initial supernova explosion, the interstellar debris cloud is faint at
   optical wavelengths. CTA 1's visible wavelength emission from still
   expanding shock fronts is revealed in this deep telescopic image, a
   frame that spans about 2 degrees across a starfield in the northern
   constellation of Cepheus. While no pulsar has since been found at radio
   wavelengths, in 2008 the Fermi Gamma-ray Space Telescope detected
   pulsed emission from CTA 1, identifying the supernova remnant's
   rotating neutron star. The source has been recognized as the first in a
   growing class of pulsars that are quiet at radio wavelengths but pulse
   in high-energy gamma-rays.

                      Tomorrow's picture: light-weekend
     __________________________________________________________________

       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
                   NASA Web Privacy, Accessibility Notices
                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

--- BBBS/Li6 v4.10 Toy-7
 * Origin: The Rusty MailBox - Penticton, BC Canada (1:153/757)
SEEN-BY: 90/1 105/81 106/201 129/305 134/100 153/135 148 757 6809
SEEN-BY: 153/7083 7715 218/700 840 221/1 6 360 226/30 227/114 229/110
SEEN-BY: 229/114 206 307 317 400 426 428 470 664 700 240/1120 266/512
SEEN-BY: 282/1038 291/111 301/1 113 812 320/219 322/757 335/364 341/66
SEEN-BY: 342/200 396/45 460/58 256 1124 633/280 712/848 5020/400 1042
SEEN-BY: 5054/30 5075/35
PATH: 153/757 221/6 301/1 460/58 229/426