Astro Alexandra on Instagram: "The largest moon in the solar system may have STACKS OF OCEANS! Meet Jupiter’s moon Ganymede #space #astronomy #nasa #science"

Astro Alexandra on Instagram: "TWO comets in the night sky this week alongside the Orionids meteor shower and the new moon! #space #astronomy #nasa #science"

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The Space Doctor on Instagram: "The creator and the destroyer. The Andromeda and Milky Way galaxies are expected to collide in about 4.5 billion years. Surprisingly the sun becomes a red giant in around the same time. So what's a red giant? When a star is about to die it increases in size, our sun will do the same. This happens before the Andromeda collides with our milky way to form Milkromeda. Is it a kind of backstab done by sun? Or something else. #space"