Orion’s Sword Source: rbrecher (reddit)

Orion’s Sword

Source: rbrecher (reddit)

Horizon to horizon Source: such_a_tommy_move (reddit)

Horizon to horizon

Source: such_a_tommy_move (reddit)

Johannes van Loon. Illustrations for Harmonia Macrocosmica by Andreas Cellarius. Star Atlas. 1660.

(Source: magictransistor, via vizualize)

Tags: history 1660

The Rosetta Mission Asks: What Can We Learn from Comets?

What’s Up for September 2014: A comet’s close encounter with Mars, and the ‘Zodiacal Light,’ evidence of the tenuous ring of dust and debris around the Sun.

idadarksky:

The Bortle Scale

The Bortle scale is a nine-level numeric scale that measures the night sky’s brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution. John E. Bortle created the scale and published it in the February 2001 edition of Sky & Telescope magazine to help amateur astronomers evaluate the darkness of an observing site, and secondarily, to compare the darkness of observing sites. The scale ranges from Class 1, the darkest skies available on Earth, through Class 9, inner-city skies.

(Source: Wikipedia)

Tags: apollo

Apollo Had No Wings, But It Could Fly

SpaceX Monthly News Summary for August 2014

SpaceX Monthly News Summary for August 2014

Dark slope streaks in Terra Sabaea Source: ASUMarsSpaceFlight

Dark slope streaks in Terra Sabaea

Source: ASUMarsSpaceFlight