Astronomy Topics
How Much Uranium is in the Solar System ? We don’t know the composition of the asteroids or the objects in the Oort comet cloud or the Kuiper belt in great detail. One theory of solar system formation is that there are more metals in the inner solar system. That would mean most of the uranium is Mars, [...]
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How many years ago was earth formed? Modern geologists and geophysicists accept that the age of the Earth is around 4.54 billion years (4.54 × 109 years ± 1%).This age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples. The Sun, by [...]
How much does planet Earth weigh? It would be more proper to ask, “What is the mass of planet Earth?”1 The quick answer to that is: approximately 6,000,000,000,000 ,000,000,000,000 (6E+24) kilograms. The interesting sub-question is, “How did anyone figure that out?” It’s not like the planet steps onto the scale each morning before it takes [...]
How many comets are there? Occasionally a comet makes the headlines, perhaps because it is visible from Earth with the unaided eye. This gives the impression that comets are rare. However, nothing could be further from the truth. There are thought to be so many comets that even astronomers can’t count them all. Comets were [...]
How many black holes are there? To use a technical term, gobs. Astronomers have discovered several dozen likely “supermassive” black holes in the cores of fairly nearby galaxies, plus many more in the distant objects known as quasars. They have discovered perhaps a dozen or two likely stellar-mass black holes in the Milky Way galaxy [...]
How many galaxies are there? Our Earth feels like all there is, but we know that it’s just a tiny planet in a vast Solar System. And our Solar System is just one member of a vast Milky Way galaxy with 200 to 400 billion stars. But how many galaxies are there in the entire [...]
How many kilometers are in the speed of light? The speed of light (usually denoted c) is a physical constant. Its value is exactly 299,792,458 metres per second, often approximated as 300,000 kilometres per second or 186,000 miles per second. It is the speed of electromagnetic radiation (such as radio waves, visible light, or gamma [...]
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How much does the sun weigh in kg? The sun weighs 1 duodecillion kilograms (two billion billion billion tons). In pounds, it weighs 220 duodecillion. Duodecillion is the fourteenth type of number in the “illions” section of numbers “millions, billion, trillons….”
How many stars are in the universe? Based on current estimates, there are between 200 – 400 billion stars in our galaxy (The Milky Way). There are possibly 100 billion galaxies in the Universe. So taking the average of our galaxy, gives approximately 3 x 1024 stars. So about 3 septillion. This has been equated [...]
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