The clouds form when summertime wisps of water vapor waft up and crystallize around specks of meteor smoke.Previous data from AIM have shown that NLCs are like a great "geophysical light bulb." They turn on every year in late spring, reaching almost full intensity over a period of 5 to 10 days.
Having decided what needs to be done, all you have to do now is get on with it.
Banish all thoughts of doubt from your mind and push ahead with your plans.
None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
Readers, thank you for your patience while we continue to develop this new section of
Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. The orbits are color-coded by velocity, from slow (red) to fast (blue).