Space

A neutron star is totally solid matter - a trillion times heavier than lead. A pinhead piece of a neutron star would weigh as much as a large building.

Earth orbits the sun at 66,000 miles per hour. It travels 595 million miles per orbit.

The sun's diameter is approximately 840,000 miles. This is 109 times more than Earth's diameter. Approximately one million Earths can fit inside the sun.

The core is the hottest part of the sun where the temperature can reach 15 million degrees. The coolest part of the sun's temperature reaches 6000 degrees.

The sun is constantly losing weight. It loses approximately 4 million tons (8 billion lbs.) of mass every second. That's 345 billion tons (690 trillion lbs.) every day! This is the amount of hydrogen gas that the sun turns into energy.

If the sun stopped shining suddenly, it would take eight minutes for people on earth to be aware of the fact.

The Moon spins once on its axis each time it goes around Earth. Because of this, we just see one side of the moon. Only space travelers have seen the other side of the moon.

Even with the best communications technology we have today, If we were to send a message to someone on a planet belonging to our closest neighboring solar system, Alpha Centauri, (4.4 light-years away) we wouldn't receive a reply message for 8.8 years.