|
Canada-653101-Relocation Service 公司名录
|
公司新闻:
- 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
- What causes fireballs in the sky? - NASA
This photograph shows one of the meteorites which survived the "Chicago Fireball"
- 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
A comet is made of dirty ice, dust, and gas When a comet gets close to the Sun, part of the ice starts to melt
- 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!
- 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
- 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!
- How do we search for alien life in the universe? - NASA
A search for signs of life in other parts of the universe is done by looking at the radio emissions of individual star systems Each star in the system is examined for possible planets that may be orbiting the star An advantage of the newly proposed Allen Telescope is that it can look at more than one star at a time
- StarChild: The Asteroid Belt - NASA
An asteroid is a bit of rock It can be thought of as what was "left over" after the Sun and all the planets were formed
|
|