The phenomenon is “something that we have not witnessed often,” the mission’s back-up astronaut Jenni Gibbons told AFP.
“They were really high priority science for us, so the fact that they saw four or five was just outstanding.”
No doubt
As the astronauts hurtled towards home, Nasa asked them about the meteorite strikes they saw during their nearly seven-hour observation period.
“Were they prolonged? And did you notice any colour?” Young asked yesterday.
“It’s a pinprick of light,” replied Canadian crew member Hansen. “I would suspect there were a lot more of them.”
“I would say they were a millisecond, like the fastest a camera shutter can open and close,” added Wiseman, who said the flashes were “white to bluish white”.
“To me there was no doubt we were seeing it, and we were all seeing it,” he added.
According to Nasa’s tally, the team – which broke the record for the furthest distance from Earth during their flyby – reported a total of six meteorite impacts on the lunar surface.
Ground crews are now working to match these observations with data from a satellite orbiting the moon, Young said, adding that the majority of the sightings took place during a solar eclipse, when the moon passed in front of the sun.
‘Challenge’
“I’m personally … surprised they would see that many, although they [had] been trained to look for them,” Bruce Betts, chief scientist at the Planetary Society, said.
According to Betts, the descriptions will allow scientists to “get some idea of the frequency of impact” as well as the size of the projectiles.
One question was what size an object needed to be to create a flash visible to the astronauts, Betts said.
“It’s not a piece of dust, but it’s not a metre-size boulder, either.”
The observations raise questions and show that the “daily flux of meteors should be monitored more closely in the future before a lunar base is established,” Peter Schultz, Professor Emeritus of Geological Sciences at Brown University, said.
On Earth, smaller objects “burn up high in the… atmosphere due to friction” before they reach the ground, noted Betts, which is not the case on the Earth’s natural satellite.
“There is more of a challenge on the moon,” he said.
– Agence France-Presse