File:Tycho-supernova-xray.jpg
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:12, 7 January 2017 | | 2,400 × 2,400 (609 KB) | 127.0.0.1 (talk) | <p><b>Tycho's Supernova Remnant</b>. In 1572, the Danish astronomer <a href="https://en.wikipedia.org/wiki/Tycho_Brahe" class="extiw" title="en:Tycho Brahe">Tycho Brahe</a> observed and studied the explosion of a star that became known as <a href="https://en.wikipedia.org/wiki/SN_1572" class="extiw" title="en:SN 1572">Tycho's supernova</a>. More than four centuries later, <a href="https://en.wikipedia.org/wiki/Chandra_X-ray_Observatory" class="extiw" title="en:Chandra X-ray Observatory">Chandra</a>'s image of the supernova remnant shows an expanding bubble of multimillion degree debris (green and red) inside a more rapidly moving shell of extremely high energy electrons (filamentary blue). As a huge ball of exploding <a href="https://en.wikipedia.org/wiki/Plasma_(physics)" class="extiw" title="en:Plasma (physics)">plasma</a>, it was <a href="//commons.wikimedia.org/wiki/Category:Irving_Langmuir" title="Category:Irving Langmuir">Irving Langmuir</a> who coined the name <i>plasma</i> because of its similarity to <a href="https://en.wikipedia.org/wiki/blood_plasma" class="extiw" title="en:blood plasma">blood plasma</a>, and <a href="https://en.wikipedia.org/wiki/Hannes_Alfv%C3%A9n" class="extiw" title="en:Hannes Alfvén">Hannes Alfvén</a> who noted its cellular nature. The filamentary blue outer shell of X-ray emitting high-speed electrons is also a characteristic of plasmas. This is a <a href="https://en.wikipedia.org/wiki/False_colour" class="extiw" title="en:False colour">false-colour</a> x-ray image in which the energy levels (in keV) of the x-rays have been assigned a colours as follows: Red 0.95-1.26 keV, Green 1.63-2.26 keV, Blue 4.1-6.1 keV. All x-rays images must use processed colours since x-rays (as are radio waves, infra-red) are invisible to the human eye. But they are not invisible to suitable equipment, such as x-ray telescopes. The red and green bands highlight the expanding cloud of <a href="https://en.wikipedia.org/wiki/Plasma_(physics)" class="extiw" title="en:Plasma (physics)">plasma</a> with temperatures in the millions of degrees. </p> |
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