Do we ever wonder about our galaxy. How vast and enormous it is. There are several of galaxies. Whats good is they follow certain patterns. They can be either elliptical or spiral. Earth is believed to be in spiral galaxy.
Its very difficult to see the picture of our entire galaxy. Several thousands of pictures are taken and then merged together to understand and study our galaxy. Spectacular it is , with billions and billions of stars.
Stars being thousand of light years away from us, can be still be seen through naked eyes from earth. These are the ones closer. Those stars shine bright. we have dust and gas which forms a dust cloud which hides the stars. However to study this, astronomers have found a wonderful trick and techniques to look deeper into the stars. First the galaxy images are taken with infrared camera. Infrared camera can detect opaque objects through sensing the heat. This reduces the view of thick dust clouds. And after this if an Xray image is taken, then we can get clear view of stars, minimising all the dust cloud.
Stars are made of gases. What happens is, hydrogen gases tries to expand, while gravity tries to pull it. this fight goes on until gravity wins and gases become denser and denser. Hydrogen gases turns to helium. Produces explosion and thus due to nuclear energy stars shine and its surrounding gases disperse.
A human life is too short to witness a star’s birth. They are born and they die with dangerous and violent explosions.
Adaptive optics gives relative clear vision to study the stars movement, which would otherwise be blurred without using this technology.
