The European Space Agency has launched a probe to study Venus. It is expected to arrive at our planetary neighbor next spring. Venus fascinates scientists because in many ways it is identical to Earth. It is roughly the same size as our planet, has similar gravity, and is composed of many of the same raw materials. Yet for reasons that are not entirely understood, Venus is a victim of a runaway greenhouse effect with an atmosphere composed of mostly carbon dioxide and an average temperature of 869 degrees Fahrenheit (465 Celsius).
In other words, kind of what like Earth will be like in another 25 years.
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