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Out There!

The Wide Field Camera 3 (WFC3), a new camera aboard NASA’s Hubble Space Telescope, snapped this image of the planetary nebula, cataloged as NGC 6302, but more popularly called the Bug Nebula or the Butterfly Nebula. WFC3 was installed by NASA astronauts in May 2009, during the servicing mission to upgrade and repair the 19-year-old Hubble telescope. Credit: NASA

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Save the Leopard

This is the Amur Leopard.
There are only 30 of these beautiful animals left in the wild on the Planet Earth!

TO HELP SAVE THEM PLEASE VISIT OUR WWF DONATION PAGE
Thank You,
Mad Earth

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Space Threats

Other Threats to the Earth from Outer Space

There are many scenarios that have been suggested that could happen in the future. Some are certain to happen and will almost certainly end humanity, but may only happen on a very long timescale, or may happen sooner. Others are likely to happen on a shorter timescale, but will probably not completely destroy civilization. Still others are extremely unlikely, and may even be impossible.

Some foreseen hazards (hence not members of the current category) which have been excluded from the list of bangs on grounds that they seem too unlikely to cause a global terminal disaster are: solar flares, supernovae, black hole explosions or mergers, gamma-ray bursts, galactic center outbursts, supervolcanoes, buildup of air pollution, gradual loss of human fertility, and various religious doomsday scenarios. - Nick Bostrom

Space

It is certain that events in space can cause life on Earth to come to an end. The certain events, however, will happen at an extremely long timescale measured in billions of years. Projections indicate that the Andromeda Galaxy is on a collision course with the Milky Way. Impact is predicted in about 3 billion years, and so Andromeda will approach at an average speed of about 140 kilometres (87 miles) per second; the two galaxies will probably merge to form a giant elliptical. This merging could eject the solar system in a more eccentric orbit and an unwanted position in the merged galaxy causing our planet to become uninhabitable (an actual collision is unnecessary).

In about 5 billion years, stellar evolution predicts our sun will exhaust its core hydrogen and become a red giant. In so doing, it will become thousands of times more luminous. Even in its current phase of stellar evolution, the sun is increasing in luminosity (at a very slow rate). Many scientists predict that in fewer than one billion years, the runaway greenhouse effect will make Earth unsuitable for life.

On an even longer time scale, the universe may come to an end. The current age of the universe is estimated as being 13.7 billion years old. There are several competing theories as to the nature of our universe and how it will end, but in all cases, there will be no life possible. These scenarios take place on a considerably longer timescale than the expansion of the sun.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Risks to civilization, humans and planet Earth".

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