Why do astronomers today think that we have an asteroid belt and not a planet between Mars and Jupiter

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

resonant frequency

e/c, where e is its total energy

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.