Rocky bodies called protoplanets were thought to have formed slightly earlier in the inner solar system than those beyond the ...

I/ATLAS, earlier known as A11pI3Z, is only the third interstellar visitor to be discovered passing through our corner of the ...

Astronomers have announced the discovery of A11pl3Z, a massive new interstellar object entering our solar system.

Because the Kuiper Belt had seemed small, one theory had been that the solar nebula that formed our planetary system had also been smaller than normal. The discovery of this Kuiper Belt 2 suggests ...

The newfound radiation belt is double-lobed, just like the radiation belts that encircle Jupiter, the largest planet in the solar system.But if the dwarf star's radiation belt were placed next to ...

“Our Solar System’s Kuiper Belt long appeared to be very small in comparison with many other planetary systems,” Wes Fraser, the lead author of the study from the National Research Council ...

This potential second belt could extend as far as 13.5 billion kilometers (8.4 billion miles) from the sun, marking a significant expansion of our known solar system.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Located beyond low-Earth orbit, these radiation belts were discovered in 1958 by astrophysicist James Van Allen who helped uncover the key to enabling exploration of the outer solar system.

Because the Kuiper Belt had seemed small, one theory had been that the solar nebula that formed our planetary system had also been smaller than normal. The discovery of this Kuiper Belt 2 suggests ...