A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.
Space scientists look back on 30 years of exoplanet discoveries — from rows of massive ‘super-Earths‘ to worlds with ...
What planet appears close to the moon? It depends on the night, but throughout the year each of the five closest planets will ...
September will have a trio celestial conjunction. Here's how to see the moon and Venus together in Arizona and upcoming alignments.
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