A: Maybe. There are many planets which may have life like ours. A few are-
There are two planets around the star Gliese 581. They are Gliese 581c and Gliese 581d. They are in the habitable zone of Gliese 581,a red dwarf,24 light years away.
There is a planet 424 light years away.
Mars is thought to have life. The rovers Spirit and Opportunity have found dead bacteria on Mars.
Europa,a moon of Jupiter is thought to have an ocean full of life under its surface of ice.
Q:WHAT IS A 'HABITABLE ZONE'?
A: A habitable zone is the region around a star where life may be possible. The distance between the habitable zone and its star depends on the size of the star.
Q:WHAT IS A LIGHT YEAR?
A: A light year is the distance traveled by time in a year. It is 5,999,999,999,999 miles and 9,555,555,555,555 km or 5.9 trillion miles and 9.5 trillion km.
Q:WHAT IS AN ASTRONOMICAL UNIT?
A:It is the distance between the earth and the sun. It is approx. 150million km.
Q:HOW DO WE KNOW THE UNIVERSE IS EXPANDING?
A:When we see objects in the sky, we see a red shift. This means the object is moving away from us and the universe is expanding.
Q:HOW DO WE KNOW THAT THERE ARE OTHER PLANETS ORBITING OTHER STARS?
A:When we see other stars, we may see them 'wobble'. This 'wobble' is caused by planets.
Q:WHAT IS THE HELIOSPHERE?
A:It is the complete stretch of the sun's gravity. It extends to about 2 light years- half way to the nearest star that is Proxima Centuri.
Q:WHY ARE DIFFERENT GALAXIES DIFFERENT SHAPES?
A:Gravity has the power to shape galaxies. It can either come from the stars and black holes inside it or from the dark matter and dark energy outside it.
