A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The bold question-askers at What If examine what life would be like if Earth were the only planet in the solar system.

Space agencies say the comet, 3I/ATLAS, poses no danger, despite viral conspiracy claims. Rumours across social media ...

Jobs Our weekly round-up of letters published in the Arizona Daily Star. More like this... 16 15 14 Letter: Autism Solved!

Fred D. Ledley first encountered Jane Goodall in 1964, at a lecture hosted by the National Geographic Society when he was 9 ...