星界の報告

星界の報告

「星界の報告(Siderevs Nvncivs)」はガリレオ・ガリレイが1610年に出版した著書。このサイトではガリレオの業績に敬意を表し,星・天文学に関する話題を紹介する。

Mars retrograde

Mars retrograde

(元記事: ihavenohonor (jaconyから))

cosmicvastness:

NASA Astronomy Picture of the Day 2014 October 20
Comet Siding Spring Passes Mars 
Yesterday, a comet passed very close to Mars. In fact, Comet C/2013 A1 (Siding Spring) passed closer to the red planet than any comet has ever passed to Earth in recorded history. To take advantage of this unique opportunity to study the close interaction of a comet and a planet, humanity currently has five active spacecraft orbiting Mars: NASA’s MAVEN, MRO, Mars Odyssey, as well as ESA’s Mars Express, and India’s Mars Orbiter. Most of these spacecraft have now sent back information that they have not been damaged by small pieces of the passing comet. These spacecraft, as well as the two active rovers on the Martian surface — NASA’s Opportunity and Curiosity — have taken data and images that will be downloaded to Earth for weeks to come and likely studied for years to come. The featured image taken yesterday, however, was not taken from Mars but from Earth and shows Comet Siding Spring on the lower left as it passed Mars, on the upper right.

cosmicvastness:

NASA Astronomy Picture of the Day 2014 October 20

Comet Siding Spring Passes Mars 

Yesterday, a comet passed very close to Mars. In fact, Comet C/2013 A1 (Siding Spring) passed closer to the red planet than any comet has ever passed to Earth in recorded history. To take advantage of this unique opportunity to study the close interaction of a comet and a planet, humanity currently has five active spacecraft orbiting Mars: NASA’s MAVEN, MRO, Mars Odyssey, as well as ESA’s Mars Express, and India’s Mars Orbiter. Most of these spacecraft have now sent back information that they have not been damaged by small pieces of the passing comet. These spacecraft, as well as the two active rovers on the Martian surface — NASA’s Opportunity and Curiosity — have taken data and images that will be downloaded to Earth for weeks to come and likely studied for years to come. The featured image taken yesterday, however, was not taken from Mars but from Earth and shows Comet Siding Spring on the lower left as it passed Mars, on the upper right.

NASA engineer Ernie Wright looks on as the first six flight ready James Webb Space Telescope’s primary mirror segments are prepped to begin final cryogenic testing at NASA’s Marshall Space Flight Center.(via The James Webb Space Telescope)

NASA engineer Ernie Wright looks on as the first six flight ready James Webb Space Telescope’s primary mirror segments are prepped to begin final cryogenic testing at NASA’s Marshall Space Flight Center.

(via The James Webb Space Telescope)