| 单词 | dust grains |
| 释义 | dust grains To date the tiny amount of material, the researchers looked for the abundance of certain atoms formed by cosmic rays hitting the dust grains. Retrieved from Wikipedia CC BY-SA 3.0 However, other dating techniques, such as comparing the isotope ratios left behind by decaying radioactive materials, cannot yet be used to provide an absolute date for these ancient dust grains. Retrieved from Wikipedia CC BY-SA 3.0 The microscopic cosmic dust grains were then separated using magnets, which attract some minerals that contain iron in the dust. Times, Sunday Times Solar heating causes gases to be released from the comet nucleus, which also carry away dust grains. Retrieved from Wikipedia CC BY-SA 3.0 However, a spacecraft would be almost constantly struck by micrometeorites, about the size of dust grains. Retrieved from Wikipedia CC BY-SA 3.0 |
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