The Abridged Version of Astrophysics

The Domestic Goblin read Neil deGrasse Tyson's 'Astrophysics for People in a Hurry' so you don't have to

The parts the DG understood

We are stardust brought to life, then empowered by the universe to figure itself out - and we have only just begun.

Among all constants, the speed of light is the most famous. No matter how fast you go, you will never overtake a beam of light.

We cannot see, touch or taste  the source of 85% of the gravity we measure in the universe. This mysterious dark matter which remian undetected except for it's gravitational pull on natter we see, may be compised of exotic particles that we have yet to discover or identify.

Dark matter is our frenemy. We have no clue what it is. It's kind of annoying. But desperately need it in our calculations to arrive at an accurate description of the universe. Scientists are generally uncomfortable whenever we must base our calculations on concepts we don't understand, but we'll do it if we have to. 

As we've known from the beginning, dark matter does indeed exert gravity, to which ordinary matter responds. But that's it. After all these years, we haven't discovered it doing anything else. For now, we must remain content to carry dark matter along as a strange, invisible friend, invoking it where and when the universe require it of us.

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