It is 15 years since Pluto lost its planetary status.

In a three-phase process in which four hydrogen atoms combine to form a helium nucleus, the Sun converts about 600 million metric tons of hydrogen per second to 596 million metric tons of helium. Then that depleted four million metric...

Cesium 137 is produced in nuclear explosions and nuclear reactors. This is a big problem with low half-life isotopes. But it has many practical uses. It is used in radiation therapy. It is dangerous that most compounds of cesium are...

Why does the earth rotate on its own axis? Why does it revolve around the sun? Why does it not collide with the sun? Answer .When the earth was formed, it rotated and revolved around the sun. According to Newton's...