Get an answer in 5 minutes
We'll notify as soon as your question has been answered.
After observing stars for many years, astronomers found that we often found them to be a different size to those previously recorded. After continuous observation, we found stars were moving away from us. Then planets were looked at: same conclusion. The theory came about as such: If all these planetary objects are moving away from us, if we go back far enough in time, they must have started very close together. Maybe even at a single point. After this came theories about how all matter ended up in one single spot. The conclusion is an implosion, followed by an explosion.
Asked by Shelly
How many elements are on the periodic table?