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 ...

Object 90377 Sedna — a distant trans-Neptunian object known best for its highly elliptical, 11,390-year-long orbit — is currently on its way towards perihelion (its closest approach to the Sun) in ...

A group of scientists from Italy proposes several options for space missions to the dwarf trans-Neptunian planet Sedna on the outskirts of the solar system. Sedna was discovered on November 13, 2023.

In 2004, astronomers announced the discovery of a red, frigid planet-like body at the outskirts of our solar system. Michael E. Brown, the Caltech astronomer who spotted the object (and who would ...

Sedna, a distant dwarf world once dubbed “Planet X,” is making its closest approach to the Sun in centuries — a narrow window ...

Our sun is a thief. Over four billion years ago, it stole hundreds of frozen mini-planets from a passing star – and the peculiar planetoid Sedna is one of them. With its extremely elongated orbit ...

More than a decade after an oddball world named Sedna was discovered on the solar system's far frontier, a fresh discovery reveals that it's not so odd after all. Sedna and the newly found object, ...

Astronomers studying 35 NASA Hubble Space Telescope (HST) images of the solar system's farthest known object, unofficially named Sedna, are surprised the object does not appear to have a companion ...

Read more: Click here to read the original, longer version of this story. Solitary Sedna (Image: NASA/JPL-Caltech) THE sun is a thief. More than 4 billion years ago, it stole hundreds of ...

NPR's Madeleine Brand talks with NPR's Ira Flatow, host of Talk of the Nation Science Friday, about this week's announcement of the discovery of a new "planetoid" astronomers have dubbed Sedna. This ...

The Solar System just got a lot more far-flung. Astronomers have discovered 1 a probable dwarf planet that orbits the Sun far beyond Pluto, in the most distant trajectory known. Together with Sedna, a ...