1) The Hubble Space Telescope, launched in 1990, has provided breathtaking images of distant galaxies and deep space.

2) Mount Everest, located in the Himalayas, is the highest mountain on Earth, reaching a peak elevation of 29,032 feet (8,848 meters).

3) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

4) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.