In nearly seventy years of deep-sea exploration, researchers compiled 43,681 submersible dive records β and found that humans have visually observed less than 0.001% of the deep seafloor, an area roughly the size of Rhode Island, according to a Science - Space Daily
A neutron star can pack more mass than our entire Sun into a sphere only about 20 kilometres across β roughly the size of a city β and a teaspoon of its material would weigh about a billion tonnes on Earth, more than every human being alive combined. - Space Daily
About 50 kilometres above Venusβ surface, the crushing heat and pressure below give way to temperatures and air pressure surprisingly close to Earthβs, a region NASA has described as the most Earth-surface-like environment in the solar system β at least b - Space Daily