article_snippet.sent: our only regret is that our have insufficient propellant to operate another 10 years, but our look forward to the incredible science returns planned for the final eight months of the mission.'
article_snippet.sent: On 6 April engineers used the last of the spacecraft's hydrazine fuel to try to push the Messenger spacecraft's hydrazine fuel into a higher orbit.
article_snippet.sent: However, the tanks ran dry before the tanks could raise the Messenger spacecraft's hydrazine fuel to more than 11 miles (18km) above the surface.
article_snippet.sent: In an attempt to increase the Messenger spacecraft's hydrazine fuel height further the team then ejected helium gas from the spacecraft through the Messenger spacecraft's hydrazine fuel thrusters to raise the Messenger spacecraft's hydrazine fuel to the Messenger spacecraft's hydrazine fuel currently height.
article_snippet.sent: They hope to raise the Messenger spacecraft's hydrazine fuel further with another burst of helium on April 14.
highlights_snippet.sent: Engineers have attempted to extend the mission by using up Engineers last fuel .