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What is beyond our sky? (galaxy)
Transcript of What is beyond our sky? (galaxy)
Hopefully with further investigation, research and technological advancement, we can delve deeper into the vastness of space and expand our knowledge of our universe
In a clear night away from any light pollution, we are able to see a band of stars twinkling in the night sky. These billions of stars are surrounded by a sea of gas and dust, which makes up our galaxy- the Milky Way. In 1900s astronomers discovered that the Milky Way was one of many galaxies as our neighbour galaxy, Andromeda, was found by the Hubble telescope. The growing capability of different technology, especially the telescopes on land and in space have enhanced our knowledge about what the whole universe hold.
Andromeda is our neighbour galaxy and is larger than the Milky Way. However, it would be unreasonable to find life in Andromeda because it's 2.5 million light years away.
A radio telescope is an astronomical instrument made up of a large metal dish which reflects the radio waves to an antenna which is attached above the dish. Radio Telescopes are an important tool as it detects any radio waves emitted by extraterrestrial objects or sources.
The Milky Way began forming around 13.6 billion years ago. The Milky Way is a barred spiral galaxy which belongs to a cluster containing about 30 galaxies and at least 100-400 billion stars.. The Milky Way is so big that it takes 100 thousand light years to travel across. The central bulge of the Milky Way is about 10,000 light-years thick. The galactic centre, which is located about 26,000 light-years from Earth, contains at least one supermassive black hole.
A light year is how distance is measured in space. It is defined by how far a beam of light travels in one year. Light moves at about 300,000km per second. One light year travels about 9,460,000,000,000 kilometers.
To get an idea, light can travel 7 times around the Earth in 1 second.
On Earth, there is plenty of radiation interference to mess with telescopes.
In 1990, NASA decided to launch the Hubble Space Telescope. Since the telescope is OUT OF THIS WORLD, the earth's atmosphere can't block it. So Hubble can provide better images of the new found galaxy. Other great telescopes in space are the Chandra X-Ray Observatory, Spitzer Space Telescope and Compton Gamma Ray Observatory
Telescopes in Space
What is beyond our sky?
- Science Essentials 10 ACE-Williamson CE
By: Emily Qiu, Eric Pham, Truc Pham and Linh Khong