Detecting Earth from distant star-based systems: Difference between revisions

Revision as of 23:25, 2 November 2023

Revision as of 07:09, 9 November 2023

Line 15:

== Experiments ==

In 1980s, astronomer [[Carl Sagan]] persuaded NASA to perform an experiment of detecting life and civilization on Earth using instruments of the ''[[Galileo (spacecraft)|Galileo]]'' spacecraft. It was launched in December 1990, and when it was 960 km from the planet's surface, ''Galileo'' turned its instruments to observe Earth. Sagan's paper was titled "A search for life on Earth from the Galileo spacecraft"; he wrote thag "high-resolution images of Australia and Antarctica obtained as ''Galileo'' flew overhead did not yield signs of civilization"; other measurements showed the presence of vegetation and detected radio transmissions.<ref>{{cite journal |last1=Witze |first1=Alexandra |title=How would we know whether there is life on Earth? This bold experiment found out |journal=Nature |date=16 October 2023 |volume=622 |issue=7983 |pages=451–452 |doi=10.1038/d41586-023-03230-z |url=https://www.nature.com/articles/d41586-023-03230-z |access-date=22 October 2023 |language=en |url-status=live |archive-url=https://archive.phtoday/nVVIZ20231019020130/https://www.nature.com/articles/d41586-023-03230-z |archive-date=19 October 2023 }}</ref><ref>{{Cite journal|url=https://www.ufrgs.br/leaa/arquivos/aulas/SERP06/1993_ASearchForLifeOnEarthFromTheGalileoSpacecraft_NATURE.pdf|title=A search for life on Earth from the Galileo spacecraft|first1=Carl|last1=Sagan|first2=W. Reid|last2=Thompson|first3=Robert|last3=Carlson|first4=Donald|last4=Gurnett|first5=Charles|last5=Hord|date=October 23, 1993|journal=Nature|volume=365|issue=6448|pages=715–721|doi=10.1038/365715a0}}</ref>

==See also==