Comet Hartley 2 (IMAGE) NASA/Goddard Space Flight Center Caption Comet Hartley 2 can be seen in detail in this image from NASA's EPOXI mission. It was taken as the spacecraft flew by from about 435 miles. The comet's nucleus, or main body, is about 1.2 miles long. Jets can be seen streaming out of the nucleus. A Goddard team would like to use a microbolometer to study these objects in greater detail. Credit Credits: NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.