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What causes a falling star? - NASA Meteors are commonly called falling stars or shooting stars If any part of the meteoroid survives burning up and actually hits the Earth, that remaining bit is then called a meteorite At certain times of year, you are likely to see a great number of meteors in the night sky
StarChild: Meteoroids - NASA Most meteors glow for only a few seconds prior to burning up before hitting the Earth's surface On most dark nights, meteors can be seen The chance of seeing a meteor with the unaided eye increases after midnight People often refer to meteors as "falling" or "shooting" stars The brightest of the meteors are called fireballs
Star Art - An Introduction to Myths of Different Cultures - NASA Star watching has occupied humans from the earliest times Our ancestors studied the night sky and saw shapes and patterns among the stars They often made up stories to explain what they saw The same star constellation was seen very differently by people from different countries, or even different parts of the same country
StarChild: Comets - NASA The Oort Cloud is believed to surround our solar system and reach over halfway to the nearest star, Alpha Centauri, which is 150,000 astronomical units away Scientists think that about 100 million comets orbit the Sun A comet has a distinct center called a nucleus
Are all stars in a galaxy? - NASA The observations show that the motion of the individual star is governed by the gravitational field of the cluster as a whole, rather than the pull of any one galaxy In other words, they are truly "intergalactic", or between galaxies
Why do stars twinkle? - NASA To our eyes, this makes the star seem to twinkle You will notice that stars closer to the horizon will appear to twinkle more than other stars This is because there is a lot more atmosphere between you and a star near the horizon than between you and a star higher in the sky Go out some night soon and have a look!
How can the Sun burn? - NASA This heating eventually grows out from the center (or core) of the star to the outside, finally leaving the surface and radiating out into space to be the heat and light we know stars emit People, including scientists, sometimes say that the Sun "burns hydrogen" to make it glow
How long does it take to fly to Saturn? - NASA The nearest star (after our Sun, of course!) is Proxima Centauri at a distance of 4 2 light years At a speed of 17 km sec (such as what the Voyager 1 spacecraft currently has), it would take about 75,000 years to reach Proxima Centauri This may explain why we are not planning any trips there at present!