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Was young, wet Mars once close enough to the Sun to 'dance' with Venus?

Planet Nine and six other baffling space mysteries scientists can't explain

Planet Nine may exist, but it might be hiding behind Neptune

Planet Nine: Ancient tapestries, texts may help expose the Solar System's biggest mystery

What would it take to land on Mercury? It's time to find out, scientists say

Water clouds in Jupiter's Great Red Spot mean alien life 'can't be ruled out'

Why Jupiter's rapid growth spurt was delayed for millions of years

Chance of alien life given massive boost as scientists reveal water 'likely' on thousands of exoplanets

On ultrahot exoplanets, water can form at night and die by day

Iron and titanium found on 'Ultrahot Jupiter,' an exoplanet first