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What causes a falling star? - NASA Answer: A "falling star" or a "shooting star" has nothing at all to do with a star! These amazing streaks of light you can sometimes see in the night sky are caused by tiny bits of dust and rock called meteoroids falling into the Earth's atmosphere and burning up The short-lived trail of light the burning meteoroid produces is called a meteor
StarChild: Meteoroids - NASA 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 Sonic booms often follow the appearance of a fireball just as thunder often follows lightning At certain times of the year, more meteors than normal can
Star Art - NASA Star Art - An Introduction to Myths of Different Cultures 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 When
StarChild: Stars - NASA A star is a big ball of gas which gives off both heat and light So where do stars come from? What happens to them as they grow older? A galaxy contains clouds of dust and gas, as well as stars It is in the clouds of dust and gas that stars are born As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin The gas atoms start
Parallax - NASA From the image above, you can see that by knowing the size of Earth's orbit and measuring the angles of the light from the star at two points in the orbit, the distance to the star can be derived The farther the star is, the smaller the angles For stars more than about 100 light-years from Earth, we cannot measure any shift and the method fails
StarChild: A Learning Center for Young Astronomers - NASA StarChild is a learning center for young astronomers ages 5-13 to learn about the solar system, the Milky Way galaxy, and the universe beyond Use the links above to explore the site's topics If you are looking for something a bit more advanced (ages 14+), then head on over to Imagine the Universe!
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!
Supernovae - NASA Supernovae At large distances (up to about 1 billion light-years), astronomers can no longer use methods such as parallax or Cepheid variables At such large distances, the parallax shift becomes too small and we can no longer even see individual stars in galaxies Astronomers then turn to a series of methods that use "standard candles", that is, objects whose absolute magnitude is thought to
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 But that is just a figure of speech
StarChild: Comets - NASA Scientists believe that comets are made up of material left over from when the Sun and the planets were formed They think that about 100,000 million comets orbit the Sun Some comets orbit the Sun like planets Their orbits take them very close to and very far away from the Sun