There are nights when the sky is clear and cloudless, looking up you see countless sparkling points of light, some of which are moving. What is this?
No need to worry! The bright, gently moving object you see is one (artificial) satellite created by humans. There are just under 3,000 satellites orbiting Earth today, and many of them are visible in the night sky.
Twinkling lights crossing the night sky could be artificial satellites.
Flickering points of light moving across the night sky could be artificial satellites. (Illustrative photo).
These satellites are operated by private companies, national governments and scientific agencies for a variety of purposes. Every time you open Google Earth or Google Maps, you see thousands of composite images of the Earth’s surface taken by satellites! Some radio services like Sirius XM are operated via satellite.
Some governments and militaries use satellites to image the Earth’s surface, whether to investigate national intelligence matters or to monitor large-scale weather systems such as hurricanes. Some satellites are even powerful astronomical tools, like the Hubble Space Telescope, which can take incredible images of other stars and galaxies because its orbit is high enough to avoid seeing through Earth’s atmosphere.
When you look up at the night sky and what do you see? it looks like a bright star is moving quickly in the sky, What you actually see is a satellite that reflects the surface of the Sun in just the right way for you to see it..
It generally moves quickly because most satellites are close enough to Earth to orbit the Earth in less than a day (so if you’re stuck for a few hours, you might see the same satellite flying across the sky again ). The satellites you see are no reason to worry, although many astronomers worry that launching more satellites into space (like Elon Musk’s plan for the Starlink satellite constellation) will make it difficult to viewing satellites in front of all the amazing stars and galaxies that await us. to discover.
In addition to satellites, there are a number of other reasons for the bright objects moving across the sky that you see, including:
- Civil aircraft: When the light is turned on, it becomes a very bright object in the sky, the brightness is equal to or even greater than that of Venus.
- Weather balloon: Usually hovering, brightness equivalent to that of a star.
- International Space Station ISS: Moves across the sky in an orbit that is usually above the horizon, very bright and fast.
- Falling Stars: Flashes very brightly then disappears, in fact it’s just a shooting star
- Military flight equipment artificial There is light which often leads to confusion.
Article source: VNReview
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There are nights when the sky is clear and cloudless, looking up you see countless sparkling points of light, some of which are moving. What is this? No need…