If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

For a long time, children learning about space in school were taught that there were nine planets in our solar system. Then, we lost Pluto after it was demoted to a dwarf planet back in 2006 and ...

From the mysterious Planet Nine to the prospect of a "human-caused meteor shower," space and physics editor Brandon Specktor ...

Astronomers are searching for a potential ninth planet, known as Planet Nine, which could reshape our understanding of ...

Astronomers are on the hunt for a mysterious ninth planet, known as Planet Nine, which could change our understanding of the solar system. Is this hidden world real, or just a myth?

An elusive Earth-like planet in our solar system could finally be discovered within the next few years. Known as Planet Nine or Planet X, it is a hypothetical planet that has long been rumoured to ...

It seems 2025 will have a strong start, too, with a planet parade just a few weeks into the new year. A planet parade is when ...

Is there an unseen planet — a "planet X" or "Planet Nine" — in the outer solar system? That possibility is supported by calculations in a new study that shows the hypothetical planet could ...

But even including Arda/Earth, these planets only account for seven of the nine planets ... was to tell an alternative history to our world. In Letter 165, collected in The Letters of J.R.R ...

The best telescopes for seeing planets give you the clearest views of our celestial neighbors ... the best planetary views all year. On January 9-10, Venus reaches its greatest eastern elongation ...