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The Birth of Our Sun |
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The Earth and Sky |
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Our Solar System |
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The Milky Way Galaxy |
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The Endless Universe |
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Get Google Newsfeed on the topic: Planet Neptune, the Icy Giant Planet
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African Continent as seen from space
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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.
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A Meteorite that struck
in prehistoric times.
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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.
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Flare of the Sun (Solar
Flare)
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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.
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Download the following images:
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Mon, 06 Sep 2010 08:39:00 GMT
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Wolters Kluwer Tax & Accounting Appoints Russell Evans as President of Wolters Kluwer Tax ... - msnbc.com Wolters Kluwer Tax & Accounting, the world's largest provider of tax, accounting and audit information, software and services to professionals in the North America, Europe and Asia Pacific regions, announced today ... | Fri, 03 Sep 2010 19:41:00 GMT
Top 5 Business Software Applications - Associated Content Here is a list of the Top 5 Business Software Applications for small businesses. 5 Sage Peachtree Complete Accounting One of the best accounting software packages, Sage Peachtree will give you all the tools you need ... | Wed, 01 Sep 2010 14:00:00 GMT
Serenic Nonprofit Software Implemented Across Africa - msnbc.com ... financial management and business operations software for nonprofits, international non-governmental organizations (NGOs) and the public sector, announced today that Serenic Navigator nonprofit accounting ... |
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