How much space junk is there? There are over 128 million pieces of space junk in orbit around Earth at the moment. There are 5,465 satellites orbiting in space at the moment. 84% of those are in a low Earth orbit. There is also the International Space Station circling the Earth. Over the last decade, […]
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How can the inner core of the Earth switch rotation? Because it is separated from the solid mantle and can rotate at a different speed. The Earth has four layers. There is the outer crust that we and everything alive lives on. The crust is about 40 km deep and is only 1% of Earth’s
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How many dimensions are there? There are either 4, 10, 11, or infinite dimensions, depending on what theory you read. What is a dimension? A dimension is the minimum number of coordinates needed to specify a point within that dimension. We can experience four dimensions. The first dimension is length. A straight line exists in
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How did Galileo realize that the Earth orbits the sun? He realized it when he observed the orbit of Venus. Galileo was born in 1564 in Pisa, Italy. Galileo is famous for saying that the Earth orbits the sun rather than the sun orbits the Earth, but he was not the first person to come
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What is the densest material in the universe? Osmium is the densest material on Earth, but the densest material in the universe (that we know of) is that of a neutron star. What is density? Density is the amount of mass that something has in relation to the space that it occupies. For example, a
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Does the Oort cloud exist? Possibly, but there is no way of knowing. It is still just a working theory. The Oort cloud was first theorized by Jan Oort, a Dutch astronomer, in 1950. The idea is that a cloud of icy comets and planetesimals are orbiting the sun at a distance of about 0.03
#433 Does the Oort cloud exist? Read More »
How far will the Voyager probes go? As far as they can get before they are eroded to nothing by space dust. Voyager 1 and 2 were both launched in 1977. As of today, December 4th 2022, Voyager 1 is about 23.7 billion kilometers from the sun and Voyager 2 is about 19.8 billion kilometers
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How thick are Saturn’s rings? The rings of Saturn are incredibly thin. They are only about 10 meters thick. Saturn is a massive planet. It is the second largest planet in the solar system and is 95 times larger than Earth. It is a gas giant, but it could have a solid cure. It has
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How big would the sun be from the surface of Mercury and from the surface of Neptune? From the planet Neptune, the sun would look only slightly brighter than all of the other stars in the sky. You would be able to look at it directly without doing any damage to your eyes. From the
Where does space end? There is no way of knowing, but there is a horizon 46 billion light years away that we can’t see past. There are five different possibilities. That the universe is infinite. That the universe wraps in on itself. That there is no “outside” to the universe. That our universe is embedded
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