The longer the exposure, the more light that the telescope can gather to make the image.  Mike needed to get a dark picture . In order to get the darkest photo, Mike made the exposure longer or shorter?
shorter
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A decrease in greenhouse gas levels decreases global temperature and an increase raises global temperature.  Polly gets her planet to reduce greenhouse gas levels. The global temperature as a result likely increases or decreases?
decreases
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In the thermosphere, temperatures increase as altitude increases.  When we are trying to move through the thermosphere the lower we go the colder or warmer it will feel?
colder
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As humidity increases, the water potential gradient across the inside and outside the leaf become more equal, and so the rate of transpiration decreases.  When it becomes less humid outside people are more likely or less likely to sweat?
less likely
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