Thoughtful Posts and Articles

By Anil Kumar Gupta CEO @ HiTech-on-web.com Twitter @hitechit

The impact of humanity on the Earth better seen than from space, and never is it more noticeable than at night. Scientists use satellite photographs of artificial lights to chart the spread of urbanizing, but such photographs also tell another story, that of energy wastage, bathing urban skies in a permanent twilight. that obscures our view of the wider Universe we inhabit. Light pollution, as it is termed, is a growing concern to environmentalists as well as astronomers. The photograph at the right, taken from the Space Shuttle, offers a closer view of the bright lights on the northeastern seaboard of the United States, looking obliquely from the north. 

A Meteorite that struck in prehistoric times.

This meteorite struck near Hoba West, Namibia, in prehistoric times. Found in 1920, it weighs 60 tonnes, one of the largest objects to survive its impact.3. Found in the Atacama Desert, Chile, in the early19th century, this stony-iron meteorite was forged during the evolution of the Solar System. Larger meteorites, whether or not they are comets remnants, have had a steady, and often drastic, influence on the evolution of the planets -the Earth included. Some that enter the Earth's atmosphere never make it to the surface. Between1975 and 1992, American satellites recorded 136 explosions in the upper atmosphere, all probably small would-be meteorites.

Flare of the Sun (Solar Flare)

This prominence from Sunspots can measure as much as 50,000 kilometers (31,000 miles) across, July 1999 was particularly large. They are convenient indicators of the Sun's overall level of activity from the Sun. Erupting prominences, can affect and, therefore, of the influence the Sun will exert upon the Earth. For example, communications, navigation systems, radio signals from the Sun can be directly related to sunspots. In fact a graph even power grids, while also producing showing sunspot activity for a given period looks almost identical to a graph auroras visible in the night skies. that shows solar radio emission for the same period. Radio signals can tell us of the existence of an otherwise obscured sunspot, and the sunspot itself mayflower into a prominence or a flare that will disturb Earth's region of space. Both prominences and flares appear as violent displays of luminous solar debris and generally may be seen as clouds of ionized matter standing out from the Sun's limb or as characteristic markings on the disc itself. But there is a difference. Prominences linger much longer on the solar surface than flares. And prominences are seen as cascades of debris that may move downward along magnetic lines to the solar surface, sometimes in the form of arches that can span many tens of thousands of miles. Thus the material that forms a prominence is largely confined to the solar atmosphere. On the other hand , flares characteristically leap out from a single point of disturbance and form plasma blast. If it is in the path of this plasma tongue, the Earth will soon experience a magnetic storm with its attendant radio interference and aurora displays. It was also observed that aurora often followed a flare-up of explosions on the Sun's surface.

Yahoo news for "Clouds on Earth" is given below:

Thu, 03 May 2012 10:50:29 -0700 Green Blog: More on the Science of Clouds and Climate The basic problem in understanding the relationship between clouds and climate change is that scientists only have a decade of detailed data to work with.

Wed, 09 May 2012 13:21:04 -0700 Giant sunspots visible from Earth BOULDER, Colo., May 9 (UPI) -- Giant sunspots have sent clouds of particles toward Earth that could bring northern auroras but aren't expected to disrupt communications, U.S. scientists said.

Thu, 17 May 2012 05:20:22 -0700 Green Blog: Clouds and Climate, Redux A new, accessible book may be useful to people taking their first dive into the role of clouds in climate.

Thu, 10 May 2012 20:37:57 -0700 Stunning high-resolution photo shows Earth's many hues (Credit: NTs OMZ) Most people are familiar with NASA's quintessential photograph of Earth -- semi-transparent white clouds sweeping over beige and green swaths of land surrounded by dark blue water. While that picture's mesmerizing, a photo has emerged showing the planet in even more color and detail, and according to some, it could be among the highest-resolution single pictures ever taken of ...

Thu, 03 May 2012 04:12:21 -0700 The Earth From Space: An Island Full of Penguins Peeks Out From Under Wave Clouds Astronauts on board the International Space Station took this picture of Ile aux Cochons, an island in the southern Indian Ocean that is home to the world's largest colony of King Penguins. The wave clouds ...

Thu, 03 May 2012 04:12:21 -0700 The Earth From Space: An Island of Penguins Peeks Out From Under Wave Clouds Astronauts on board the International Space Station took this picture of Ile aux Cochons, an island in the southern Indian Ocean that is home to the world's largest colony of King Penguins. The wave clouds ...

Thu, 03 May 2012 10:50:29 -0700 Dot Earth Blog: A Fresh Look at Clouds, and Heat, in the Greenhouse A closer look at research on the role of clouds in global warming

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