| 1. | Observed from the ground, this phenomenon is known as noctilucent clouds.
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| 2. | Night clouds or "'noctilucent clouds "'are tenuous cloud-like phenomena in the upper atmosphere.
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| 3. | The CARE will be the first space viewing of an artificial noctilucent cloud.
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| 4. | Noctilucent clouds may be confused with cirrus clouds, but appear sharper under magnification.
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| 5. | Noctilucent clouds may occasionally take on more of a red or orange hue.
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| 6. | The SHIMMER instrument has previously viewed natural noctilucent clouds for the past two years.
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| 7. | Noctilucent clouds are wavy, bluish-white clouds that form at rarefied altitudes near 50 miles.
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| 8. | Like noctilucent clouds, nacreous clouds are rare for our latitude here in South Florida.
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| 9. | Comprised of tiny ice particles, noctilucent clouds are so thin that stars shine brightly through them.
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| 10. | On June 22, 50 miles in the sky over Boulder, a silver-bluish noctilucent cloud drifted overhead.
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