In past time human beings see towards the space and things that what things are available in space and after the twinkling stars. And in space how much the dark is deep? And so much mysteries behind the universe.

 All these imaginations of the people become true and the doubts of there mind is solve In the year 1957 when Soviet union send its first satellite named as Sputnik 1.

After four years in 12th April 1961 yuri gagarin from Soviet union and he was the first person who goes in the moon and then we able to find so many mysterious about the universe. After this the American moon mission to artificial satellites, international Space stations, Hubble Space telescope and Voyager with the help of these we explore about the universe from the Earth but Do you know that how much we go inside the universe? 

so let's start...

Today, the most distant objects we can see are more than 30 billion light-years away

Friends if we talk about us. Till now we don't able to go so far from the Earth in July 1979 by the Apollo mission The Skylab space station re-enters Earth's atmosphere after six years in orbit. It is perhaps the highly anticipated return of any spacecraft ever, save Apollo 13.
In May 1973 the first U.S. space station, launched as a science and engineering laboratory, was not a success. 
It was intended that Skylab remain in orbit throughout the 1980s. It fell well short of that, but there were some achievements, especially in the areas of solar research and the adaptation of astronauts to longer periods in space.
 Three crew members of Apollo group traveled to Skylab and the goes first time about 4,00,000 kilometre away from our home planet and revolves around the moon and covers the largest distance till now.
Friends if we talk about the universe this distance is very small because the universe is very large. Today we are not able to go so far from our Earth so it's not mean that we we not know nothing about the universe according to scientists till now we saw only about 95% part of Universe and know about that brief.


Voyager 1 and Voyager 2


In year 1977 NASA send 2 space crafts in universe named as Voyager 1 and Voyager 2 the motto of these spacecrafts is that to send the information about the universe and information of our solar system on the earth. These two spacecrafts helps us to know very mysterious information about universe. Such that these Voyagers tells us that on the moon of the Jupiter the volcanoes are available like the earth and on the moon of Jupiter named as Urena the oceans are available and they also tells us that the natural satellite of Saturn named as Titan oceanes of hydrocarbons are available and that are made up of ethane and methane and helps us to know that Saturn in a ring planet. They also send clear picture of Uranus and tells that on the moon of Napture the nitrogen gas is available. Voyager send us a very thriller information about the universe. 
Voyager 2 launched on Aug. 20, 1977, and Voyager 1 launched about two weeks later, on Sept. 5. Since then, the spacecraft have been traveling along different flight paths and at different speeds.
Having operated for 43 years, as of March 2021 UTC , the spacecraft still communicates with the Deep Space Network to receive routine commands and to transmit data to Earth. Real-time distance and velocity data is provided by NASA and JPL. At a distance of 152.2 AU (22.8 billion km; 14.1 billion mi) from Earth as of January 12, 2020, it is the most distant human-made object from Earth.


Hubble space telescope


After this Hubble space telescope is very helpful for us to Knowing in the information about the universe. The distance of it from the Earth is 568 km away. It has power to see at infinity distance in the space. The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest.
The Hubble telescope is named after astronomer Edwin Hubble and is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.
Hubble space telescope sends the images of many galaxies which is at the distance of million's light year from our Earth. By the help of this telescope we are able to know that there are infinite stars in the universe and this tells us there are 2 trillion galaxies in the universe. In these galaxies 1101 is the largest galaxy and Hubble is show us the picture of that galaxies those are very far from Earth.
This telescope also helps us to know that teh galaxy where our earth is found that named as Milky way is 1,00,000 light years long. 
Till now Hubble Space telescope helps us to know the structure, shape and size of the universe. This telescope is works properly till now but now this becomes old and in coming 10 years it can be destroyed but the research about the universe is end due to this. The place of Hubble space telescope is taken by  James Webb Space Telescope (JWST) which is scheduled to be launched in late 2021. This technique space telescope helps us to know the information about the planets that is placed very far from the Earth.


Friends, from this post you can imagine that how much greater our universe is. And what is available outside from visible universe and what is inside or outside from invisible universe. Today no-one knows about it but in future this is becomes possible to know about these by the help of advanced technology.