How are stars born?
How does a cold molecular cloud become a hot protostar? Explore gravity, cooling and accretion disks, and distinguish early light from sustained hydrogen fusion.
Tag archive
#gravity
Articles: 7
What is a star, and what is it made of?
Why does the Sun’s gas neither disperse nor shrink without limit? Separate hydrogen from plasma and understand pressure, gravity and light without an ordinary flame.
What is mass, and how is it different from weight?
On the Moon, the same load presses less strongly on a support without losing mass. Separate kilograms, newtons, gravity and scale readings on Earth, the Moon and Mars.
Why do astronauts float in weightlessness?
Earth’s gravity remains strong in orbit. Compare gravitational force with a scale reading and discover why a person, cabin and loose objects float together in free fall.
Why doesn’t the Moon fall onto Earth?
Earth attracts the Moon, yet the Moon avoids its surface. Compare four hypothetical launches and discover how sideways motion and gravity produce an orbit.
Why do objects fall to the ground?
Why does paper fall slowly while a hammer falls quickly? Separate gravity from air resistance, read a free-fall diagram and test the conclusion with Apollo 15.
Why are planets round?
How self-gravity overcomes material strength, why asteroids keep irregular shapes, and how rotation flattens Earth and Saturn. There is no universal size threshold for roundness.