Get clear, concise, and accurate answers to your questions on IDNLearn.com. Discover reliable and timely information on any topic from our network of experienced professionals.

The fact that the ratio of helium to hydrogen in the Universe is so large (25%:75%) is evidence thatthe whole Universe was once as hot as the interior of a starnuclear fusion rates in stars were much higher in the pastthe expansion of the Universe is acceleratingthe age of the Universe is roughly 14 billion years