Register to reply

How much of the visible universe have we explored?

by iDimension
Tags: explored, universe, visible
Share this thread:
Apr5-14, 03:27 PM
P: 23
I'd like to know how much of the visible universe we've physically explored. Either with space probes, rovers or in person.

I know we have a probe around every planet in our own solar system? So given the amount of galaxies, planets our there ect how much of the visible universe have we explored? As a percentage?
Phys.Org News Partner Astronomy news on
Eclipsing binary stars discovered by high school students
Swirling electrons in the whirlpool galaxy
A spectacular landscape of star formation
Apr5-14, 04:01 PM
P: 703
If you were to be very generous with labeling what we've explored so far, and take the volume of a sphere with the centre at the Sun and the radius equal to how far Voyager 1 has reached(about 125 AU), it would encompass the volume equal to 0.032 cubic light-years.
The observable universe's radius is estimated at about 45 billion light years, so its total volume would be 3.7*10^32 cubic light years, or 37 with 31 zeroes.
This makes our solar system as 'explored' by Voyager be a whooping 0.00000000000000000000000000000001 percent of the observable universe.

But, as mentioned earlier, it's a very generous number. We don't have probes around every planet. We had probes fly by every planet, if that counts. We've landed probes on just a few, and they rarely remained operational for long.

Bottom line: Earth is a tiny speck in the mind-boggling vastness of space.

Have a look at this NASA page about Solar System exploration:
It lists all the missions so far.

Register to reply

Related Discussions
Flat visible universe Cosmology 11
Is there an event horizon beyond the visible universe? Cosmology 15
Visible Universe a fuzzball? Cosmology 2
What lies beyond the visible universe? Cosmology 1
Has this idea been explored? Why the universe expands... Cosmology 48