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mass

The Secret of the Stars

February 27, 2013

Want to stay on top of all the space news? Follow @universetoday on Twitter “Say, do you like mystery stories? Well we have one for you. The concept: relativity.” Well look at that, it’s a new video from John D. Boswell — aka melodysheep — which goes into autotuned detail about one of the standard [...]

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Podcast: Mass

July 16, 2012

Last week we talked about energy, and this week we’ll talk about mass. And here’s the crazy thing. Mass, matter, the stuff that the Universe is made of, is the same thing as energy. They’re connected through Einstein’s famous formula – E=mc2. But what is mass, how do we measure it, and how does it [...]

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Atomic Mass Unit

January 21, 2010

Believe it or not, there are actually several atomic mass units … however, the one that’s standard – throughout chemistry, physics, biology, etc – is the unified atomic mass unit (symbol u). It is defined as 1/12 (one-twelfth) of the mass of an isolated carbon-12 atom, in its ground state, at rest. You’ll still sometime [...]

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Earth’s Mass

December 9, 2009

The Earth’s mass is 5.9736 x 1024 kg. That’s a big number, so let’s write it out in full: 5,973,600,000,000,000,000,000,000 kg. You could also say the Earth’s mass is 5.9 sextillion tonnes. Phew, that’s a lot of mass. That sounds like a lot, and it is, but the Earth has a fraction of the mass [...]

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Atoms in the Universe

July 30, 2009

The number of atoms in the entire observable universe is estimated to be within the range of 1078 to 1082. We’ve added the word ‘observable’ because we realize that there are really many things to discover about the entire universe so, basically, that range back there is only an estimate based upon what we currently [...]

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