Why did it take so long to notice that the ozone layer had holes in it? Which satellite provided the data?
Would the national flag planted by astronauts on Mars need an upper horizontal pole like the ones on the Moon?
If someone built a vacuum tunnel through the atmosphere, could you have an orbit with a sea level perigee?
In simple terms, how does the way space suits manage breathable gas differ from how scuba gear does it?
When did planetary scientists realize Venus' surface pressure was almost 100x that on Earth? How did they find out?
How can an *increase* in atmospheric temperature cause an *increase* in the atmospheric mass density?
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