Context: The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system.

Question: What was the name of the first satellite launched for the system?
Answer: BeiDou-1A

Question: When was BeiDou-1A launched?
Answer: 20 December 2000

Question: What was the name of the third satellite launched for the system?
Answer: BeiDou-1C

Question: What was the purpose of launching the BeiDou-1C satellite?
Answer: a backup satellite

Question: When was the BeiDou-1C satellite launched?
Answer: 25 May 2003

Question: What was the name of the eighth satellite launched for the system?
Answer: Unanswerable

Question: When was BeiDou-1D launched?
Answer: Unanswerable

Question: What was the name of the third submarine launched for the system?
Answer: Unanswerable

Question: When was the BeiDou-1C rocket launched?
Answer: Unanswerable

Question: The unsuccessful launch of BeiDou-1E happened when?
Answer: Unanswerable