#761 What is a nebula?
What is a nebula? It is an enormous cloud of dust and gas in space. The word nebula is a Latin word, and it means “mist or cloud”. You can…
What is a nebula? It is an enormous cloud of dust and gas in space. The word nebula is a Latin word, and it means “mist or cloud”. You can…
How long did it take for the sun to get hot? Approximately 10 million years for it to start burning. The sun is hot because of nuclear fusion, which is…
How does a hydrogen fuel cell work? They split hydrogen atoms into protons and electrons to generate electricity. There are several different types of fuel cell. This is how a…
I learned this today. The surface tension of water is higher than almost all other liquids because it contains so much hydrogen. Surface tension is what allows droplets to form…
I learned this today. The Hindenburg airship probably caught fire because of a static electric charge that ignited the highly flammable hydrogen it was filled with. The Hindenburg was actually…
I learned this today. Stars die because they exhaust all of their fuel. There are seven different types of star. They are classified using the Morgan-Keenan system. They are given…