Recent content by David Roberts

Great discussion. I fall on the side of the line that is "why not have both?" I know that time is of the essence and most times we can't educate a growing mind quick enough to pump the information into it before it hardens, like quick dry cement.

Push and pull are two different types of forces. As most engineers know, you can't push on a rope or at least you shouldn't expect to get anything moved. Not disagreeing, just adding a nuance.

So we are back to a heavier element that doesn't interact with light. At the moment from what I have read, we do not have any candidates for that element. Are there invisible heavy elements that would fit this niche? Maybe a heavy noble gas? But the mechanism of collecting it in the density we...

Hydrogen and Helium are pervasive throughout our universe so their interaction with light is universal too. Dark Matter has been theorized to not interact with light but couldn't that be masked by the Helium and Hydrogen we already see?