Based on a recent (summer 2018) study, the
Milky Way is around
200,000 light years
A light year is the distance light
travels in vacuum over the course of one Earth
year, equal to almost 6,000 billion miles.
That conversion makes 200,000 light years
difficult to imagine. To try to put it
into perspective, the distance light travels in
one second is roughly 8x the distance around
Earth's equator (a light year is 32 million
times farther than that); the distance from Earth
to the sun (93 million miles) is 8 light minutes
(= 0.000015 light years).
The man-made object most
distant from Earth is
Voyager 1, launched in 1977.
it left our solar system, at which
point the spacecraft was at 121x the sun-Earth
distance. That distance, even at 11.3 billion
miles, is only 0.002 light years.
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