Sep 22, 2014

711-million kilometer journey

Ảnh do NASA cung cấp mô tả tàu vũ trụ MAVEN  tiếp cận sao Hỏa.

 Phi thuyền  nghiên cứu  không  gian
 MAVEN đến Hoả Tính  

NASA’s newest Mars probe, called MAVEN, has successfully entered its designated orbit around the "red planet." Scientists will use its sophisticated instruments to try to learn what happened to the atmosphere Mars had a few billion years ago.

After a 10-month, 711-million kilometer journey, MAVEN’s thrusters slowed it down to enter into orbit Sunday around Mars.

MAVEN, which stands for ‘Mars Atmosphere and Volatile Evolution Mission’, will try to find answers to two simple questions: “Where did the water go? Where did the carbon dioxide go?”

MAVEN principal investigator Bruce Jakosky says scientists now know that Mars once had a much denser atmosphere, but it changed significantly over the last few billion years when most of its gases disappeared into space. What they still don’t know is how and why that happened.

“We are trying to understand what the cause of that climate change has been, and we are looking at the role that escape to space may have played in removing the atmosphere, and changing the atmosphere,” he said.

Source: NASA's MAVEN Spacecraft Arrives at Mars