Is universe infinite?
Does it have an end?
What lies beyond it?
From our home planet earth to moon at a distance to 3,84,400 km. Next, to mars distance 22.5 crore km then crossing our solar system having a diameter of 9.09 billion km. Moving ahead to NASA’s satellite Voyager 1 beyond our solar system at 18.8 billion km. Next, stepping out of our milky way galaxy which is 1,00,000 light years wider moving with the speed of 828,000 km/hr. Lightyear refers to the distance travelled by light in one year.
1 light year= 9460730472580.8 km speed of light= 299,792,458 m/s
I know ………..
Our galactic neighbour, Triangulum, Andromeda and various dwarf galaxies NGC 6822, LEO 1, LMC etc forms a local group of galaxy inside a diameter of 10 million light years. These local group of galaxies collectively known as Virgo supercluster spread across the region of 100 million light years includes laniakea supercluster where our home galaxy is located, MOF301 supercluster etc.
Precisely, the age of universe is 13.82 billion light years but actual observed universe is 93 billion light-years wider. Space is stretching itself faster than the speed of light.
Alan Guth proposed an idea of inflation i.e energy in vacuum forms virtual particles, suddenly jump to higher energy level resulting in space-time expansion. By the time photons from distant galaxy would reach us, space-time would have been expanded. Therefore, no laws of physics are violated, no speed limit is disturbed and no paradoxes are created. All matter and space inside the region of 93 billion light years diameter is known as observable universe
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Laniakea supercluster Milkyway galaxy Orion arm Earth