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1973 Red Planet Mars Map

2 Apr

1973 Red Planet Mars Map

Explore the Red Planet in striking detail with this educational map published in February 1973. This map was half of a two-part piece, appearing with a complete index map entitled “The Dusty Face of Mars” and two additional articles on Mars: “Journey to Mars” and “The Search for Life on Mars.” Featuring detailed illustrations of Mars from different angles, this map also contains an abundance of illustrations and information about the planet’s physical attributes including atmosphere, surface color, magnetic field, winds, and temperature.
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Twilight

1 Oct

Each type of twilight depends on how far the sun is below the horizon after sunset of before sunrise.  During civil twilight, there’s enough light to find your way around with ease and Venus is visible; in nautical twilight the horizon is indistinct and the first stars come out.  True dark night begins at the end of astronomical twilight.  10 degrees equals one fist held out at arm’s length against the sky.  Credit TW Carlson

Did that say Sanduleak -69° ?

22 Nov


SN 1987A was a supernova in the outskirts of the Tarantula Nebula in the Large Magellanic Cloud, a nearby dwarf galaxy. It occurred approximately 51.4 kiloparsecs from Earth, approximately 168,000 light-years,[1] close enough that it was visible to the naked eye. It could be seen from the Southern Hemisphere. It was the closest observed supernova since SN 1604, which occurred in the Milky Way itself. The light from the new supernova reached Earth on February 23, 1987.

Progenitor

Four days after the event was recorded, the progenitor star was tentatively identified as Sanduleak -69° 202, a blue supergiant.[6] This was an unexpected identification, because at the time a blue supergiant was not considered a possibility for a supernova event in existing models of high mass stellar evolution. Many models of the progenitor have attributed the color to its chemical composition, particularly the low levels of heavy elements, among other factors.

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The Evening and Morning Star

14 Nov

 

http://www.johnpratt.com/items/astronomy/eve_morn.html

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November 11, 2012 before Dawn

12 Nov

Spica is the brightest star in the constellation Virgo, and the 15th brightest star in the nighttime sky.

 

http://earthsky.org/

 

 

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Venus overtakes the Earth on the inside every 584 days, but because of the inclined orbit, transits occur only four times every 243 years

10 Nov

Venus overtakes the Earth on the inside every 584 days, but because of the inclined orbit, transits occur only four times every 243 years