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We're always learning more about far away galaxies and exoplanets, but we still have some pretty big mysteries hanging out here in the solar system, like why Venus spins the way it does.

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Sources:

https://www.annualreviews.org/doi/10....
https://www.sciencedirect.com/science...
https://www108.lamp.le.ac.uk/ojs1/ind...
https://www.nature.com/articles/35081000
https://www.sciencedirect.com/science...
http://adsabs.harvard.edu/abs/1977A%2...
https://www.annualreviews.org/doi/10....
https://agupubs.onlinelibrary.wiley.c...

Images:

https://svs.gsfc.nasa.gov/11923
https://svs.gsfc.nasa.gov/3728
https://svs.gsfc.nasa.gov/20027
https://svs.gsfc.nasa.gov/11693
https://en.wikipedia.org/wiki/File:Ve...
https://en.wikipedia.org/wiki/File:Ma...