No one has yet proved that life exists on other planets. However, as there are billions of stars, some with planets, it seems unlikely that Earth is the only place with the right conditions for life. Astronomers use radio telescopes to search for messages from other civilizations. In 1963, they thought they had found the first traces of intelligent extraterrestrial life when regular pulse of radio waves were detected. In fact they had found strange distant galaxies called quasars.
Showing posts with label mystery. Show all posts
Showing posts with label mystery. Show all posts
Monday, October 15, 2007
Do Aliens really exist?
No one has yet proved that life exists on other planets. However, as there are billions of stars, some with planets, it seems unlikely that Earth is the only place with the right conditions for life. Astronomers use radio telescopes to search for messages from other civilizations. In 1963, they thought they had found the first traces of intelligent extraterrestrial life when regular pulse of radio waves were detected. In fact they had found strange distant galaxies called quasars.
Sunday, October 14, 2007
How old is the Universe?
It is impossible to calculate the exact age of the universe, since no one is alive to supervise its growth. However, estimation is used to calculate it. The scientists can estimate the age of the universe by looking at how fast distant galaxies are moving away from us. Based of scientists' estimation, the universe is about 13,000 million years old.
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