Science feed
No sound
Ordinary sound cannot travel through an ideal vacuum because it needs matter to transmit a mechanical disturbance. Light and radio waves can cross a vacuum because they are electromagnetic waves.
0.01°C
Water can coexist as ice, liquid and vapor near its triple point, about 0.01 °C and 611 pascals. In a vacuum demonstration, evaporative cooling can make liquid water freeze while it is still boiling.
Low contrast
The Great Wall is generally not discernible with the unaided eye from low Earth orbit, and it is not visible from the Moon. Saying it can never be seen from any altitude called space is too absolute: viewing conditions, equipment and identification all matter.