International Space Station atmospheric drag reboost

Even the space station meets air resistance

The International Space Station orbits 370–460 km above Earth, well beyond the conventional 100-km boundary of space. Yet the atmosphere there creates enough drag that the station needs a boost every few months. About 99.99997% of Earth’s atmospheric mass lies below that boundary.

Beta-carotene supplements do not prevent cancer

Beta-carotene supplements have not been shown to prevent cancer. Among people already at high risk, taking them can actually increase the risk of lung cancer.

Soap helps bubbles last longer even though it lowers surface tension

Pure-water bubbles usually burst quickly because their thin liquid films drain and break. Soap molecules reduce surface tension, but they also help stabilize the film by resisting uneven thinning. That is why adding soap makes it easier to blow long-lasting bubbles. Lower surface tension does not automatically mean a weaker bubble.

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International Space Station atmospheric drag reboost

Even the space station meets air resistance

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