SPACE FOR HUMANITY

HOW DOES LOOKING AT DISTANT GALAXIES ALLOW US TO LOOK BACK IN TIME.

When telescope look at the light from distant Galaxy, they are not literary look back in time, the past no longer exist, so no one can directly look at it. Instead, the Telescope are looking at the present time pattern of beam of light. Since the beam of light has been traveling through the mostly empty vacuum of space for millions of years, it has been largely undisturbed. Therefore, the present time pattern of beam of light is the same as the pattern that it had when it was first created by the distant Galaxy millions years ago. By looking at the present time pattern of beam of light, we can thus infer what the galaxy that created the light looked like millions of years ago.

Voyager 2 has reported a significant increase in the density of space outside the solar system. The farther The spacecraft, the more the density is increasing. This discovery has challenged the accepted notion of space being vacuum. Voyager 2 was launched in 1977 and had been wandering in the cosmos for 43 years . At 1.6billions miles, it is one of the farthest man made object from the earth. The Voyager 2 enable us to have in-depth knowledge about the Jupiter and Saturn. It is the second spacecraft to enter interstellar space after Voyager 1.