These discoveries changed the world! For this list, well be looking at the most groundbreaking discoveries in various scientific fields from each year of the 21st century so far. Our countdown includes The Age of the Universe, Mars Surface Shows Signs of Water, Tracking Down the Higgs boson, Evidence of Planet Nine, CRISPR Gene Editing Treats Genetic Disease, and more! Which of these gives you the most hope for the future? Let us know in the comments!

Watch more great science videos here:
Top 10 Things We Wish Science Would Figure Out: https://youtu.be/t4Rw0xLNz-Y
Top 10 Biggest Scientific Discoveries of 2020: https://youtu.be/2WxR_2-faYY
Top 20 Biggest Scientific Discoveries of the Decade: https://youtu.be/tIvtkMRFj-Q

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