The shortest international border is between Botswana and Zambia — about 150 meters

Lesotho is entirely surrounded by South Africa — one of only three countries fully inside another

Lesotho is a landlocked country entirely within South Africa's borders

How long does it take for radio waves from the Voyager 1 spacecraft, launched in 1977, to reach Earth, given the current distance between the two?

Voyager 1's radio waves take approximately 17 hours to reach Earth, considering its current distance of about 145.3 astronomical units

Light from the Sun takes 8 minutes and 20 seconds to reach Earth

Sunlight travels approximately 149.6 million kilometers to Earth in 8 minutes and 20 seconds

Mongolia is the most sparsely populated country — 2 people per square kilometer

Mongolia has a population density of approximately 2 people per square kilometer

Your DNA stretched end to end would reach the Sun and back over 600 times

Human DNA length: 2 meters, Sun-Earth distance: 150 million km, repetitions: 900,000,000

The observable universe is about 93 billion light-years in diameter

The observable universe spans approximately 93 billion light-years across