In the 70s, my then-boyfriend and I took a camping trip to the Wharton State Forest – the Pine Barrens of New Jersey. We would see truckloads of odd-looking people drive into the Nice for The Love Of Philly Philadelphia 76ers shirt (not on paved roads – sand and dirt) and never come out that we could see. We figured there must be roads leading out of the campground, maybe shortcuts, so late one afternoon decided to see where one of these went. We had my mother’s Oldsmobile, a rather heavy car, and went for what seemed like miles, never finding anything, except smaller, more narrow paths off the main road. It was getting late, so we turned around to go back and got stuck…the car dug into the soft, sandy road and we couldn’t get out. John decided he would walk back to the campsite and contact a ranger, leaving me with the car.
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Ever watch a whirlpool? How about water going down a drain or even a I would workout but my cat needs me paw cat T Shirt of cream swirled into your coffee? It sometimes looks like a spiral galaxy. And we once thought gravity was holding a galaxy together. If you watch a whirlpool carefully you will notice the outside orbits the center slowly and the closer to the middle you are the faster it spins. But this was a bit of a problem for galaxies because this would make the arms of the galaxy wind up tight. They would not last for millions of years. Earlier in the century, before computers, astronomer would hire dozens of women who were good at math to do calculations for them. One of them made an important discovery: the speed of the stars in the outer arms was way faster than it should be. The galaxy was spinning like a solid LP record album! According to the laws of gravity, which we know quite well, it shouldn’t behave like this…unless there was WAY more mass than we could see. And the issue of *dark matter* was born. Yes, there would be a lot of dust and gas and planets and small stars we couldn’t see. But all that is still not enough for the behavior we observe. It is a mystery we are still working on!
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