Don't be fooled, many of these misconceptions even sound plausible! ⬇️
are essentially lumps of dirty ice. As they approach the sun they heat up, releasing gas and dust. On Earth, we would expect the resulting tail to point backward, like the streak of a falling meteor, but in space, there is no air. Comets are shaped and blown by radiation pressure and solar winds, so they always point away from the sun.electrons
and forming charged ions. These get caught up in magnetic field lines and shoot directly away from the sun in a blue ion tail. At the same time, dust is released into space, forming a tail of particles as fine as smoke. Photons of light from the sun create an intense bubble of pressure, which pushes against the dust, guiding it into a wide streak that curves around the path of the comet's speedy orbit.As meteorites pass through the atmosphere they heat up so rapidly that the surface rock begins to melt. However, it is a bit like searing a steak: although the outside becomes intensely hot, the inside remains cool.
In space, the particles are so far apart that sound waves cannot propagate, so although the source of an explosion would vibrate, the movements have nowhere to go. Outside of Earth, only on planets with atmospheres would we hear sound.Outer space is the closest place to a true vacuum in the universe and is far emptier of any particles than anything we can produce on Earth. However, there is so much hydrogen in the universe that a few atoms can still be found in every cubic meter of space.
To all intents and purposes, it is a vacuum, especially compared to the atom-rich atmosphere of Earth, but it's not perfect and nowhere in space can be guaranteed to be a true vacuum in the strictest sense. Actually, craft like the International Space Station is constantly under the influence of Earth's gravity — that's what keeps them in orbit.
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