The video illustrates the fundamentals of gravity.
Physical objects attract each other with a force proportional to the mass.
Free-fall is a result of the gravitational force between the earth (or in this case the moon) and the object falling (in this case the hammer and the feather).
Because the force between these two objects in proportional to mass, the acceleration is the same for all falling bodies.
Why on earth does a feather fall slower than a hammer? Air resistance
The moon has essentially no atmosphere (a vacuum) so there is no air resistance and we see how falling bodies fall at the same rate despite their mass
The moons gravity is ~16.7% that of earths
(~1.63m/s^2 on moon~ 9.81m/s^2 on earth)
This is due to the fact that the moon is much lass massive than the earth
The decreased gravity allows us to see the free fall in slow motion compared with what would see on earth.
The first scientist to figure this out was Galeileo Galilei, who also greatly improved the design of the telescope, and helped prove Copernicus's theory of Heliocentrism
Here is a set of microscopic images of snowflakes. The first one looks like some amalgamation of greek architecture and a coral reef. Be sure to pay attention to the scale shown in the bottom right of the images. A micrometer (μm) is 1.0 times 10^-6 of a meter, or one millionth of a meter, or one thousandth of a millimeter.
This LINK has a great visual interface to explore volcanoes, earthquakes, tornadoes, and hurricanes. We are talking about volcanoes in Earth Science right now so please check out the volcano page and make your own volcano.
