In 2076, the dwarf planet Sedna will make its closest approach to the Sun in 11,400 years, and scientists are now figuring out the best way to visit the outer solar system visitor before its too late.

Turns out, our seemly placid star had a criminal youth of cosmic proportions. A recent study out from Leiden Observatory and Cornell University may shed light on the curious case of one of the solar ...

Planetary scientists continue to debate what Sedna’s presence says about the history of our solar system. Now, S. Alan Stern of the Southwest Research Institute in Boulder, Colorado, says large bodies ...

In 2003, scientists discovered an object beyond Neptune that was unlike any other: Sedna. While there were larger dwarf planets beyond Neptune, and comets that would travel farther from the Sun, Sedna ...

In the outer reaches of our solar system, far beyond the orbit of Pluto, lies Sedna, one of the most mysterious objects ever discovered. This reddish dwarf planet follows such an extreme orbit that it ...

While new discoveries about Mars continue to make headlines, another “red planet”—known as Sedna (or 90377 Sedna)—is making its way into the inner solar system. At this moment, the crimson-hued dwarf ...

These values differ somewhat from those originally announced. Mike Brown notes that Sedna’s aphelion and semimajor axis are known to within about 10 percent and may still change slightly with ...

Astronomers have detected what could be the Solar System's 10th planet. It was first seen by astronomers using California's Palomar Observatory, and has been given the name "Sedna" after the Inuit ...