November 13th 1978
Einstein Observatory (HEAO-2) was the first fully imaging X ray telescope put into space and the second of NASA`s three High Energy Astrophysical Observatories. Named HEAO B before launch, the observatory's name was changed to honour Albert Einstein upon its successfully attaining orbit.
The Einstein Observatory satellite re-entered the Earth's atmosphere and burned up on March 25, 1982.
- First high resolution spectroscopy and morphological studies of supernova remnants.
- Recognized that coronal emissions in normal stars are stronger than expected.
- Resolved numerous X-ray sources in the Andromeda Galaxy and the Magellanic Clouds.
- First study of the X-ray emitting gas in galaxies and clusters of galaxies revealing cooling inflow and cluster evolution.
- Detected X-ray jets from Cen A and M87 aligned with radio jets.
- First medium and Deep X-ray surveys
- Discovery of thousands of "serendipitous" sources
November 13th 1577
Tycho Brahe, who is said to have first viewed the comet slightly before sunset on November 13 after having returned from a day of fishing, was the most distinguished observer and documenter of the comet's passing.
Tycho saw the comet pass behind the Moon thus proving that comets were not atmospheric phenomena and existed beyond the Earth`s atmosphere.