Hubble Space Telescope – What is it?
Hubble’s earliest and most profound discovery is its extreme precise measurement of the age of the universe. Using a massive and luminous star known as the Cepheid variable whose pulses matches their intrinsic brightness which allows us to measure their distance. These galactic yardsticks were used by Hubble to measure distance on unimaginable scale. By understanding distance and galaxies moving away from each other we can calculate the age of the universe. From Hubble’s very precise measurements of Cepheid variables astronomers calculated it has been 13.79 billion years since the expansion of the universe started. Not only was Hubble designed to find the age of the universe, it was also used to find arguably one of the most exotic objects in our universe. A dark, hyper, compact, dead star – a black hole.
How a star dies depends primarily on how big it is. Stars that are at least 20 times the mass of our sun die in titanic Supernovae. Inside these dead nations their cores collapse. There is so much matter in such a tiny space gravity overwhelms all other forces and nothing can escape the collapse of space time around the singularity. These were predictions found in Einstein’s equation of relativity. Hubble confirmed their existence in the early 1990s but it did not do it alone. Several ground-based and space-based worked in tandem with Hubble to help us understand these strange and powerful objects origins.
As our knowledge of black holes grew we learned that at the center of nearly most galaxies is a super massive black hole. It seems to interact with the rest of the galaxies structure. These super-massive black holes are hundreds of millions of times more massive than the sun. This research extends to the present day and because of the groundbreaking observations of Hubble entirely new studies of astronomy have been created. Hubble continues to give us new inside into not just the deaths of stars but their birth and where we all come from.
How Many Stars Are In The Milky Way Galaxy?
In an attempt to trying to understand how many galaxies may actually be in the universe astronomers pointed the telescope to a spotless sky where nothing appeared to be. No stars, no nebulae, nothing. Thousands of galaxies filled the image, every point of pale, yellow, and red light is an entire galaxy. Each one with billions of stars. No other instrument ever built by humanity has changed and sculpted our view of our place in the universe than the Hubble Space Telescope. Hubble has shown us first hand just how big the universe really is.