2. 1.ARE THERE OTHER EARTHS?
A RECENT DISCOVERY-
TWENTY LIGHT YEARS AWAY FROM US LIES A STAR CALLED GLIESE
581. ASTRONOMERS HAVE IDENTIFIED 3 PLANETS ORBITING GLIESE.
ONE IS TOO HOT FOR LIFE , ONE IS TOO COLD , BUT ONE IS IN THE
GOLDILOCKS ZONE-AND IT MAY BE JUST RIGHT.
4. 2. A STAR IS BORN
CLUSTERS OF STARS ARE CONSTANTLY BEING BORN FROM
CLOUDS OF DUST AND GAS THOUSANDS OF TIMES THE SIZE
OF OUR SOLAR SYSTEM, IN A PROCESS THAT CAN TAKE
MILLIONS OF YEARS.
6. 3. DEATH OF A STAR
STARS ARE BORN,LIVE OUT THEIR
LIVES,AND,ULTIMATELY,DIE . IN DYING ,ALL THEIR
ELEMENTS ARE THROWN BACK INTO THE CLOUDS OF
GAS AND DUST FORM WHICH THEY FORMED, AND
THE PROCESS BEGINS AGAIN.