Be a Space Detective [antikvár]

i! 'ii','' I ^vrsMf I i^'Twmmi.'.V : I i''I w,''' i ' i-'i'' 'I ' I: , ,1How did it all begin?The stars, planets, galaxies, and the space around them form the Universe. No one knows how big the Universe is. The furthest astronomers can see is about 15,000 million light years, or 885,000 million million million miles! But the Universe probably stretches much, much farther than that!Most astronomers believe that the Universe began about 15,000 million years ago in a gigantic explosion, called the "Big Bang." A tiny cluster of energy blew apart, scattering hot gases out into space. The galaxies formed from this material. No one knows what happened before the Big Bang.