I am going to post this again, the US may be trying to cover this up but the UK Ministry of defense recently de-classified most of it's UFO information,
The UK ministry of Defence said the following about these balls of Plasma/Light UFO's...
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Unidentified Aerial Phenomena (UAP) in the UK Air Defence Region

The Ministry of Defence has released this report in response to a Freedom of Information request and we are pleased to now make it available to a wider audience via the MOD Freedom of Information Publication Scheme. Where indicated information is withheld in accordance with Section 26 (Defence), Section 27 (International Relations) and Section 40 (Personal Information) of the Freedom of Information Act 2000.

[link to www.mod.uk]

That Unidentified Arial Phenomenon (UAP or UFO) Exist is indisputable. Credited with the ability to hover, land, take off, accelerate to astonishing velocities and vanish. They can reportedly alter their direction of flight suddenly and clearly can exhibit acrodynamic characteristics well beyond those of any known aircraft or missle - either manned or unmanned.

The Conditions for the initial formation and sustaining what apparently bouyant charged masses (of Plasma), which can form, seperate, merge, hover climp, dive, and accelerate are not completly understood.

Dependant on a colour's temprature and aerosol density, it may be seen visually, either by it self generated plasma color, by reflected light, or silhouette by light blockage and background contrast.

Occationally and perhaps exeptionally, it seems a field with, undetermined characteristics can exist between certain charged bouyant plasma objects in loose formation, the intervening space between them forms an area, viewed as a shape, often Triangular, from which the reflection of light does not occur. This is a key finding in the attribution of what have frequently been called black "Craft", often triangular and up to hundreds of feet in length.

- The UK Ministry of Defence



For those actually interested in current scientific opinion about UAPs. A documentary called ‘The Portal: The Hessdalen Light Phenomenon’ [2009] explains the latest scientific research and conclusions about the light phenomena seen in the remote Norwegian valley of Hessdalen.

[link to www.youtube.com]

Background information:

Hessdalen is a small valley in the central part of Norway. At the end of 1981 through 1984, residents of the Valley became concerned and alarmed about strange, unexplained lights that appeared at many locations throughout the Valley. Hundreds of lights were observed. At the peak of activity there were about 20 reports a week.

Project Hessdalen was established in the summer of 1983. A field investigation was carried out between 21.January and 26.February 1984. Fifty-three light observations were made during the field investigation. Assistant professor Erling Strand, the founder of the Hessdalen project, conducted together with the author the first international congress of the Hessdalen phenomena in 1994. This congress attracted scientists from all over the world and boosted the scientific research in Hessdalen.
Statements from the congress indicated that explanation of the phenomena could lead to new
concepts in physics. This congress also started the collaboration between Østfold University College in Norway and CNR in Italy. Together with Dr. Stelio Montebugnoli the author started the EMBLA project, with the purpose of studying the electromagnetic radiation and behavior of the Hessdalen phenomena in 1999. Lights are still being observed in the Hessdalen Valley, but their frequency has decreased to about 20 observations a year.

The following is the conclusions from over 25 years of research and after Italian SETI scientists got involved with much more highly sophisticated equipment.

*The phenomenon is identified as a bright flying object with special characteristics making it unique to science.
*The phenomenon is more complex and diverse than expected, indicating more than 1 single kind of phenomenon.
*The phenomenon is sometimes made up of separate units that may depart and fly away.
*The speed varies from still to 8km per second.
*The phenomenon changes course in speeds indicating no mass by physical means.
*The phenomenon seems to be able to take on pieces of plasma or energy from the ground whilst passing by.
*The phenomenon seems to radiate energy due to the light and frequency change of colour.
*Many interesting spectra in the optical and radio frequency range have been detected but more data is needed to draw proper conclusions.

“These scientific data are quite sensational! We are dealing with a real existing phenomenon which can be observed even though this is difficult.” Terje Toftenes, 2009

Research paper:
10 YEARS OF SCIENTIFIC RESEARCH OF THE HESSDALEN PHENOMENA (2004)
[link to www.itacomm.net]