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Even today, more than eighty years after Oort's bold guess, we still don't have a clue what this dark matter is made of. We know it exists. We know where it is. We have maps of its presence within and around galaxies throughout the universe. We even have stringent constraints on what it is not, but we have no clue what it is. And yes, its presence is overwhelming: for every one kilogram of ordinary matter made out of neutrons and protons and electrons, there are five kilograms of dark matter, ma
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― The Universe in Your Hand: A Journey Through Space, Time, and Beyond
― The Universe in Your Hand: A Journey Through Space, Time, and Beyond
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Hashtags enable you to teach the internet what to tell people.
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You've stumbled upon a door where your mind is the key. There are none who will lend you guidanc…more
1 member,
last active 16 years ago
No more just school roleplays or just one main Roleplay time to be what you want and do what you…more
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last active 14 years ago
Look at Title
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last active 11 years ago
This is where we say what we are reading and if we want to say anything about our book non-spoil…more
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last active 9 years ago