A Star Came Within 0.8 Light-Years Of Our Sun 70,000 Years Ago

An international team of astronomers has identified a star that passed through the outer reaches of the Oort Cloud some 70,000 years ago. It came within a distance of 0.8 light-years, making it the closest known flyby of a star to the Solar System. » 2/18/15 7:20am 2/18/15 7:20am

A Dangerous Nemesis Star May Visit Our Solar System Many Years From Now

A stellar orange dwarf has a 90% chance of passing through the outer reaches of our solar system no earlier than a quarter of a million years from now. Sure, that's a long way off, but this unwelcome guest could perturb the Oort cloud, flinging dangerous comets towards Earth. » 12/30/14 9:20am 12/30/14 9:20am

Meet our newest neighbour, VP113

The outer solar system has a new dwarf planet! Orbiting between 12 and 70 billion kilometers, 2012 VP113 is joining Sedna in the Oort Cloud. » 3/26/14 8:33pm 3/26/14 8:33pm

There really could be a giant planet hidden far beyond Pluto

Pluto is about forty times the distance from the Sun as Earth. But the Solar System is over 50000 times that length across, meaning it could be hiding some huge secrets. That's now looking like a small but real possibility. » 2/21/12 5:00pm 2/21/12 5:00pm

The search is on for a giant tenth planet hidden in the Oort Cloud

We might just be on the verge of discovering a real Planet X, according to astronomers John Matese and Dan Whitmire. Subtle gravitational influences on comets way out in the Oort Cloud suggest there could be a huge gas giant affecting the other objects, and now NASA's Wise space telescope has given us the data to… » 2/15/11 12:07pm 2/15/11 12:07pm

Gigantic hidden planet could be hurling comets at the rest of the solar…

Far away in the frozen outermost depths of our solar system, there might be a hidden planet four times the size of Jupiter. This secret companion to the Sun could be responsible for sending comets into the inner solar system. » 12/03/10 8:00am 12/03/10 8:00am

Our solar system is home to immigrant comets from alien stars

At the furthest edges of our solar system lies the vast Oort Cloud, a hypothetical giant shell full of billions of frozen comets. Formed 4.5 billion years ago, the cloud is a frozen museum of the chemistries of neighboring stars. » 11/28/10 1:05pm 11/28/10 1:05pm

Dawn in the Oort Cloud

If you're wondering about the sunny view from the Oort Cloud, that vast sphere of debris that surrounds our solar system, here it is. As we told you yesterday, scientists now believe this remote, cold region might house another Earth-like planet. Only it would be frozen. Want to travel a little closer to the sun, and… » 2/19/08 7:00am 2/19/08 7:00am

A Second Earth in Our Solar System

Traveling to another Earth-like world just got a lot easier. It turns out that there may be many other dirt-and-water planets lurking at the edges of our solar system in places like the Oort Cloud. These planets, which could be roughly the size of our own, would contain all the elements we need for life. They're just… » 2/18/08 4:30pm 2/18/08 4:30pm