A rogue star passed through our solar system about 70,000 years ago.

[retromike22]

This was interesting:

http://m.bbc.com/news/science-environment-31519875

An alien star passed through our Solar System just 70,000 years ago, astronomers have discovered.

No other star is known to have approached this close to us.

An international team of researchers says it came five times closer than our current nearest neighbour - Proxima Centauri.

The object, a red dwarf known as Scholz's star, cruised through the outer reaches of the Solar System - a region known as the Oort Cloud.

[○∙◄☻¥tπ[╪AV┼cVê└]

It sounds like it may have been a light year away.

[Associate Justice PiT]

It sounds like it may have been a light year away.

     Yeah, the title of the thread sounds like it was hanging out around Saturn. There could potentially be an unknown star in our solar system right now.

[True Federalist (진정한 연방 주의자)]

It sounds like it may have been a light year away.

     Yeah, the title of the thread sounds like it was hanging out around Saturn. There could potentially be an unknown star in our solar system right now.

No.  Even a brown dwarf should have been detected by now.

[Starbucks Union Thug HokeyPuck]

Quite fascinating.  The idea of anything foreign passing through our little stellar neighborhood, considering the scale of the universe, just gets me wondering about what else could come close.  Larger stars, small black holes, gamma ray bursts... so fragile our solar system is.  Anything could disrupt this delicate balance.  Of course, the very fact that we can think about these things is a direct result of being relatively uninterrupted for our 4.3 billion year planetary history.

[Joe Republic]

What was it like, Grumps?

[Atlas Has Shrugged]

Too bad it happened 60,000 years before Kim Ill Sung created the world.

[kcguy]

What was it like, Grumps?

I shouldn't answer for someone else, but it was kind of like this.

https://www.youtube.com/watch?v=LhAobPugvsk

[Associate Justice PiT]

It sounds like it may have been a light year away.

     Yeah, the title of the thread sounds like it was hanging out around Saturn. There could potentially be an unknown star in our solar system right now.

No.  Even a brown dwarf should have been detected by now.

     Items below a certain apparent magnitude won't necessarily have been catalogued at this point. It's very unlikely that such a thing exists, but it hasn't stopped astronomers from talking about it from time to time.

[True Federalist (진정한 연방 주의자)]

It sounds like it may have been a light year away.

     Yeah, the title of the thread sounds like it was hanging out around Saturn. There could potentially be an unknown star in our solar system right now.

No.  Even a brown dwarf should have been detected by now.

     Items below a certain apparent magnitude won't necessarily have been catalogued at this point. It's very unlikely that such a thing exists, but it hasn't stopped astronomers from talking about it from time to time.

Anything below a brown dwarf within our solar system wouldn't be a star.  Now it's quite possible that there might be an undetected sub-brown dwarf in the outer fringes of our solar system, but under current IAU definitions, it would be a planet, not a star.