How big would the moon appear with no atmosphere?
47374
Why does the moon appear bigger close to the horizon, rising or setting?
73618
Why is the sky of the moon always dark?
104840
If there was a black hole on earth, what would it look like?
16817
What would happen to a teaspoon of neutron star material if released on Earth?
2757
Would you be weightless at the center of the Earth?
21662
What was the density of the universe when it was only the size of our solar system?
22633
How close does light have to be, to orbit a perfect sphere the size and mass of Earth?
92591
Could a Dyson Sphere-like object be made to encase a black hole without collapsing?
31046
How much iron would I have to shoot into the Sun to blow it up?
22702
If Earth had rings?
100308
Temperature in space
154100
Why is the surface of the Moon white?
48981
How far into space does one have to travel to see the entire sphere of earth?
156136
How can we see the moon while it's between the Earth and the Sun?
20872
Is it possible for a physical object to have an irrational length?
61857
Flames with no gravity?
139385
What is the microscopic picture for warm air rising?