What is escape velocity? Escape velocity is the minimum speed an object needs for it to be able to escape the gravitational pull of a celestial body. Everything in the universe has gravity. Even dark matter has gravity, which is how astronomers know it is there even though they can’t see it. The gravity of […]
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What happens to the human body in space? Astronauts in space lose bone mass and their muscles weaken. Their blood volume decreases, and their heart can shrink. They are exposed to radiation, and they may have mental changes as well. People have only been going into space for 64 years. The first person in space
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When will the Milky Way and Andromeda collide? The Milky Way Galaxy and the Andromeda Galaxy will collide in about 4.5 billion years. None of us, nor our sun, will be here to see it. We might still be in the Milky Way, but we certainly won’t be here on Earth. The Milky Way Galaxy
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Is it possible to deflect an asteroid? It is, to a certain extent. The deflection has to happen early enough, and the asteroid has to be small enough for it to work. Earth has been hit by countless asteroids over the eons. We are hit by over 17,000 meteors a year. Meteors are pieces of
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What is a quasar? A quasar is a very bright energy source at the center of a young, newly formed galaxy. All of the quasars we can see are incredibly far away from us. The word quasar is the shortened form of quasi-stellar radio source and they were named by an astrophysicist called Hong-Yee Chiu
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Which of the planets have an atmosphere? All of the planets in our solar system except for Merucry actually have an atmosphere, but they vary in thickness. We all obviously know that our planet has an atmosphere and what it is made of. It is 78% nitrogen, 21% oxygen, 0.9% argon, and the rest is
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How quickly would you die in the vacuum of space? It depends on the size of the person and the situation, but the average person would probably die after a couple of minutes unprotected in the vacuum of space. When we watch movies, we often see someone lose their helmet in space and then their
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How can astronomers detect planets? Astronomers can detect planets by seeing how they dim their stars, how they pull on their stars, and how they filter the light coming from their stars. So far, astronomers have detected 5,867 planets in 4,377 planetary systems. There are another 2,958 that haven’t been confirmed yet. That’ll bring the
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What is the Great Filter? The Great Filter is one of the possible explanations for why we might not find other intelligent life in the universe. It is a point at which no intelligent life can pass. You may have heard of the Fermi Paradox. I wrote an article about it before. Enrico Fermi was
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What is the Boötes Void? The Boötes Void is an area of space 330 million light years across that only contains 60 galaxies. It is found in the constellation known as Boötes. It is sometimes called the “Great Nothing”. The Boötes Void was discovered by an astronomer called Robert Kirshner in 1981. He was looking
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