News

Curious tilt of the Sun traced to undiscovered Planet Nine

20 October 2016 Astronomy Now

Planet Nine — the undiscovered planet at the edge of the solar system that was predicted by the work of Caltech’s Konstantin Batygin and Mike Brown in January 2016 — appears to be responsible for the unusual tilt of the Sun. The large and distant planet may be adding a wobble to the solar system, giving the appearance that the Sun is tilted slightly.

News

Extreme trans-Neptunian objects lead the way to Planet Nine

13 June 2016 Astronomy Now

In the race towards the discovery of Planet Nine, scientists from around the world strive to calculate its orbit using the tracks left by the small bodies that move well beyond Neptune. Now, astronomers from Spain and Cambridge University have confirmed that the orbits of the six extreme trans-Neptunian objects that served as a reference to announce the existence of Planet Nine are not as stable as originally thought.

News

Did the young Sun steal Planet 9 from another star?

31 May 2016 Astronomy Now

Through a computer-simulated study, astronomers at Lund University in Sweden show that it is highly likely the so-called Planet 9 is an exoplanet. This would make it the first such body to be discovered inside our own solar system — when or if it is found. The theory is that our Sun, in its youth some 4.5 billion years ago, stole Planet 9 from its original star.

News

Planet Nine: a world that shouldn’t exist

3 May 2016 Astronomy Now

Earlier this year scientists presented evidence for Planet Nine, a Neptune-mass planet in an elliptical orbit 10 times farther from our Sun than Pluto. New research examining theories how this planet could end up in such a distant orbit finds that most scenarios have low probabilities. Therefore, the presence of Planet Nine remains a bit of a mystery.