Ebb (spacecraft) | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/GRAIL


00:00:58 1 Overview
00:02:25 2 Objectives
00:03:38 3 Spacecraft
00:03:48 3.1 Instruments
00:04:31 3.2 Propulsion
00:05:15 4 Mission profile
00:05:25 4.1 Launch attempts
00:05:39 4.2 Transit phase
00:06:47 4.3 Science phase
00:07:55 4.4 Terminal phase
00:08:05 4.5 Final experiment and mission end



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Speaking Rate: 0.8174874759463757
Voice name: en-GB-Wavenet-B


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SUMMARY
=======
The Gravity Recovery and Interior Laboratory (GRAIL) was an American lunar science mission in NASA's Discovery Program which used high-quality gravitational field mapping of the Moon to determine its interior structure. The two small spacecraft GRAIL A (Ebb) and GRAIL B (Flow)  were launched on 10 September 2011 aboard a single launch vehicle: the most-powerful configuration of a Delta II, the 7920H-10. GRAIL A separated from the rocket about nine minutes after launch, GRAIL B followed about eight minutes later. They arrived at their orbits around the Moon 25 hours apart. The first probe entered orbit on 31 December 2011 and the second followed on 1 January 2012. The two spacecraft impacted the Lunar surface on December 17, 2012.