Liquid water lakes on Mars have been postulated to be buried underneath the south polar ice cap. The data from the Mars Express orbiter strongly suggest it. So does this mean that we can go swimming when we visit Mars on a vacation? Not exactly. Let's talk about how these lakes are discovered and what they are likely composed of. Also, let's talk about mysterious dark matter, what it could be, and it's impact on how we see the universe, courtesy of Hubble. Image from NASA.

• Underground lakes on Mars
  
• Dark matter observations from Hubble and VLT
  
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