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The ESA Hipparcos team worked for 20 years on the project, then had to watch as the mission ALMOST failed! But somehow, they turned it around, and today, this little-known mission has totally transformed what we know about space.

Hosted by: Reid Rimers

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Sources:
https://sci.esa.int/web/hipparcos/-/4…
https://sci.esa.int/web/hipparcos/-/3…
https://www.cosmos.esa.int/web/hippar…
http://www.astronomy.com/news/2005/01…
https://www.cosmos.esa.int/documents/…
https://wwwhip.obspm.fr/heritage/hipp…
https://www.spenvis.oma.be/help/backg…
http://adsabs.harvard.edu/abs/1997A&A…
https://doi.org/10.1051/0004-6361:200…

http://adsabs.harvard.edu/abs/1997A&A…
http://adsabs.harvard.edu/abs/2000A&A…
https://arxiv.org/pdf/astro-ph/970710…
https://iopscience.iop.org/article/10…
https://www.cosmos.esa.int/documents/…
Planck: https://arxiv.org/abs/1807.06209
SL9: https://www.cambridge.org/core/servic…
https://nssdc.gsfc.nasa.gov/planetary…
Other discoveries: https://iopscience.iop.org/article/10…
https://www.cosmos.esa.int/web/hippar…
https://arxiv.org/abs/astro-ph/9707253
https://www.cosmos.esa.int/documents/…

Image Sources:
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://svs.gsfc.nasa.gov/3951
https://en.wikipedia.org/wiki/File:Th…
https://apod.nasa.gov/apod/ap130909.html
https://svs.gsfc.nasa.gov/12900
https://www.istockphoto.com/photo/clo…
https://www.flickr.com/photos/gsfc/85…
https://www.videoblocks.com/video/fly…
https://solarsystem.nasa.gov/resource…