\(concentration~in~g/dm^3 = \frac{mass~of~solute~in~g}{volume~in~dm^3}\) The units for concentration can also be shown as g dm-3, but this means the same as g/dm 3. 8 g of sodium hydroxide is ...

If we could see our own galaxy in its entirety, as we see NGC 6744, a twin galaxy 30 million light years away, measuring the Milky Way’s mass would be easy. But we see it from our place in one of its ...

You are looking at the most precise gravity map ever made of a distant galaxy cluster. Using the map, astronomers have determined that the cluster is roughly 650,000 light-years across and contains ...