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SN1987A

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SN 1987A was a peculiar type II supernova in the Large Magellanic Cloud , a dwarf galaxy satellite of the Milky Way . It occurred approximately 51.4 kiloparsecs (168,000 light-years ) from Earth and was the closest observed supernova since Kepler's Supernova , visible from earth in 1604. 1987A's light reached Earth on February 23, 1987, [5] and as the first supernova discovered that year, was labeled "1987A". Its brightness peaked in May, with an apparent magnitude of about 3. It was the first opportunity for modern astronomers to study the development of a supernova in great detail, and its observations have provided much insight into core-collapse supernovae . SN 1987A provided the first chance to confirm by direct observation the radioactive source of the energy for visible light emissions, by detecting predicted gamma-ray line radiation from two of its abundant radioactive nuclei. This proved the radioactive nature of the long-duration post-explosio...
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Planet Viz

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  file:///C:/Users/danws/AppData/Local/Temp/hydro_202021-almanac_planet-visibility.pdf 16 ASTRONOMICAL INFORMATION | New Zealand Nautical Almanac 2020 – 21 ASTRONOMICAL PLANET VISIBILITY 2020 – 2021 The following diagrams show, in graphical form, when the five “naked-eye” planets Mercury, Venus, Mars, Jupiter and Saturn are visible in the night sky during the period July 2020 – June 2021. Each diagram spans the hours of darkness, covering the period from 16:00 to 08:00 with midnight being represented by the central line across the diagram. For a given date, time runs from the bottom to the top of the diagram. Times are shown in terms of New Zealand Standard Time; one hour must be added when New Zealand Daylight Time is in force. Each diagram is plotted for Wellington; time differences at other locations in New Zealand will generally not exceed an hour. In addition to the planet information, the diagrams show the time of sunset and sunrise as well as the end and start of astronom...
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Hubble Deep Fields

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 One of the main scientific justifications for building Hubble was to measure the size and age of the Universe and test theories about its origin. Images of faint galaxies give 'fossil' clues as to how the Universe looked in the remote past and how it may have evolved with time. The Deep Fields gave astronomers the first really clear look back to the time when galaxies were forming. The first deep fields – Hubble Deep Field North and South – gave astronomers a peephole to the ancient Universe for the first time, and caused a real revolution in modern astronomy. Subsequent deep imagery from Hubble, including the Hubble Ultra Deep Field , has revealed the most distant galaxies ever observed . Because of the time it has taken their light to reach us, we see some of these galaxies as they were just half a billion years after the Big Bang. http://www.spacetelescope.org/science/deep_fields/   Video  
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