The First Time We Met a Comet, We Blew a Hole in It

In the first mission of its kind, Deep Impact’s goal was to teach us about the interior of comets...by blowing a hole in the side of one!

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Sources:
https://phys.org/news/2014-11-timeline-deep-space-comet-encounters.html
https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2005-001A
https://www.nasa.gov/mission_pages/stardust/news/stardust20110215.html
https://books.google.com/books?id=NvI0AgAAQBAJ&pg=PA18&lpg=PA18&dq=deep+impact+5+million+kg&source=bl&ots=uEx7s1CcpR&sig=ACfU3U3Tt7Yk2tVTUBtYUvUl0tjbifh00Q&hl=en&sa=X&ved=2ahUKEwjSrNvb1LTpAhUNUKwKHezBBZEQ6AEwAHoECAkQAQ#v=onepage&q=deep%20impact%205%20million%20kg&f=false
https://www.astrobio.net/meteoritescomets-and-asteroids/icy-dirtballs-not-dirty-snowballs/
https://www.nytimes.com/2005/09/07/science/composition-of-a-comet-poses-a-puzzle-for-scientists.html
https://www.nasa.gov/mission_pages/epoxi/epoxi20110616.html
https://www.nasa.gov/mission_pages/LCROSS/FAQs/index.html
http://news.bbc.co.uk/2/hi/science/nature/4647673.stm

Images:
https://commons.wikimedia.org/wiki/File:Deep_Impact.jpg
https://commons.wikimedia.org/wiki/File:Lspn_comet_halley.jpg
https://commons.wikimedia.org/wiki/File:Comet_21P_Giacobini-Zinner.jpg
https://commons.wikimedia.org/wiki/File:Comet_Borrelly_Nucleus.jpg
https://commons.wikimedia.org/wiki/File:PIA02142_Tempel_1_bottom_sharped.jpg
https://commons.wikimedia.org/wiki/File:Deep_Impact_HRI_tests.jpg
https://commons.wikimedia.org/wiki/File:90855main_dispcrft.svg
https://www.istockphoto.com/photo/conjunction-of-comet-c-2014-q2-and-star-cluster-m45-gm535913199-57376782
https://commons.wikimedia.org/wiki/File:Delta_II_7925_(2925)_rocket_with_Deep_Impact.jpg
https://commons.wikimedia.org/wiki/File:ITS_Impact.gif
https://commons.wikimedia.org/wiki/File:HRIV_Impact.gif
https://commons.wikimedia.org/wiki/File:Deep_Impact_approach_2.jpg
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA13857
https://commons.wikimedia.org/wiki/File:Rosetta_and_Philae_at_comet_(11206660686).jpg
https://commons.wikimedia.org/wiki/File:Deep_Impact_HRI.jpeg
https://commons.wikimedia.org/wiki/File:Tempel_crater_4090_h1_4097_h1.jpg
https://commons.wikimedia.org/wiki/File:Comet_Hartley_2.jpg
https://commons.wikimedia.org/wiki/File:LCROSS_Centaur_1.jpg
https://www.istockphoto.com/photo/impact-earth-meteor-in-route-collision-gm469156150-62267818
https://www.jpl.nasa.gov/missions/deep-impact/