Правильный перевод ! 50 mars is cold. venus is hot. earth is right. what makes the temperatures on these planets so different? part of the answer is that planets close to the sun are far away. another piece of the answer is the greenhouse effect. to see this effect for yourself, try this experiment. you will need a small thermometer, a glass big enough to keep the thermometer, a piece of the black paper, and a sunny day. put the paper on a table in the sun. turn the glass upside down, and place it on the paper with the thermometer inside the glass. in a minute, the air inside the glass will begin to get warmer, and the thermometer will show the rising temperature. the glass lets light in but doesn't let heat our. some gases, for example, carbon dioxide (co2), work like the glass. they warm up a planet by letting sunlight pass through and not letting the heat go out. they are called greenhouse gases. our atmosphere keeps earth warm. you have probably heard that scientists have found that the earth's temperature is slowly rising because of greenhouse gases. no one knows how seriousthis problem may become. to be safe, many people are working to reduce the greenhouse effect. each of us can help a little. we can plant trees, which take carbon dioxide when they grow. also, we can find how to save energy, for example, we can turn off lights when we are not using them.

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