| Could the milky way have already collided with another galaxy like 6 billion years ago? | 16 | | | | |
| What did we learn from that probe that touched the sun a year ago? | 13 | | | | |
| Would this work, why or why not? | 1 | | | | |
| What star is this that I am looking at in the night sky? | 1 | | | | |
| Would Aliens understand music? | 1 | | | | |
| Artificial Gravity. | 1 | | | | |
| How would extraterrestrials understand music if they never had music or emotion of their own? | 1 | | | | |
| Is this possible for Artificial Gravity? | 1 | | | | |
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