An atom is mostly empty space, but empty space is mostly not empty ... t send humans to Mars 'The Ice Skating Sisters' were rising stars beloved at their home rink before tragedy struck Untouched ...

1 AU is the average distance between the Earth and the Sun and is approximately equal to 150,000,000 km (or 1.5 × 10 11 m). Distances between the Earth and other stars and galaxies are measured ...

"The space between the stars is not empty, but rather filled with filaments of dust and gas (known as the interstellar medium), which is often invisible until something illuminates it," NASA ...