#27 Planet Mercury normally keeps a low profile, but let's take a closer look at the first planet from the sun.

03/31/21 • 5 min

We don't get to hear much about planet Mercury. It took us a long time to learn much about it and only two spacecraft have ever been there.
Let's take a look at some of the little known but fascinating facts about Mercury's history, why it has the longest day in the solar system and what we've learned from lonely pair of spacecraft that have visited it.
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undefined - #26 What's the matter? Really, what is the matter that makes up 80% of the mass of the universe but can't be observed directly. The strange story of dark matter

#26 What's the matter? Really, what is the matter that makes up 80% of the mass of the universe but can't be observed directly. The strange story of dark matter

So back in the 1930's, astronomers noticed that there didn't seem to be enough mass in galactic clusters to hold them together, but they were held together. There mas be some additional mass and gravity to hold everything together, but where is it? It can't be seen. And this problem produced the theory of dark matter.
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#28 Planet Venus. It's Earth's twin - but somehow remains mysterious. Let's take a look.

Planet Venus is sometimes called Earth's twin. It's the same size and in planetary terms it's close by, but why isn't it our first choice for exploration? Some of the differences make Venus super difficult to study so in a way it remains mysterious.
Why is it difficult to study? And what makes the environment on Venus so harsh?
Grab a coffee and join us as we unravel the mystery and take a closer look.
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