Earth is the third planet from the Sun and the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4.5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Moon, Earth's only natural satellite. Earth revolves around the Sun in 365.26 days, a period known as an Earth year. During this time, Earth rotates about its axis about 366.26 times.
Climate change is set to increase the susceptibility of forest ecosystems to damage by alien invasive pests and pathogens. EU scientists investigated ways to counter this threat in order to prevent a decrease in primary production, and hence yield, as well as loss of vulnerable tree species.
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