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seen Oct 13 at 9:08

May
5
reviewed Reviewed What would happen if an ice cube is left in space?
May
5
reviewed Close Build a high quality telescope from scratch
May
5
reviewed Close Hamiltonian of general three body problem
Apr
30
comment Why is Mars' atmosphere so thin?
I would add: most of Mars oxygen were captured by iron-bearing rocks which get oxydized. This is why it is orange-red.
Apr
25
comment Does the Sun have hard radiation?
There are no chemical reactions on Auroras. They are on the order of particle physics, not chemistry. Edited.
Apr
25
revised Does the Sun have hard radiation?
There are no chemical reactions on Auroras. They are on the order of particle physics, not chemistry.
Apr
24
answered Relation between position of stars and locations of gemstones?
Apr
24
reviewed Approve suggested edit on Why is the solar system often shown as a 2D plane?
Apr
24
reviewed Reject suggested edit on Did big bang happen only one time or it might happen again somewhere million time away from our observable universe?
Apr
23
answered Putting mass-luminosity relation and HS diagrams together leads us to a mass-age relation; so how do stars lose their mass over time?
Apr
23
comment Why is iron responsible for causing a supernova?
@Jeremy Yes. And what about that?
Apr
23
reviewed Approve suggested edit on What is the difference between our time and space time?
Apr
23
comment Does the earth's atmosphere act as a spherical lens and refract light from space?
@FlorinAndrei You are quite right. Seeing is the blur of the Airy's disc.
Apr
22
answered Does the earth's atmosphere act as a spherical lens and refract light from space?
Apr
22
comment Why is iron responsible for causing a supernova?
@Jeremy no, it is Fe, but there is quite a plateau from Fe56 to Sr86. What happens with Ni62 is that it is the most tightly bond. en.wikipedia.org/wiki/…
Apr
22
comment Why is iron responsible for causing a supernova?
@Py-ser Iron is not the last element created by fusion. It is the last for which fusion produces energy. Further elements up to Uranium (last natural element) actually consume energy when creating.
Apr
21
reviewed Approve suggested edit on Are satellites orbiting around earth visible to the naked eye?
Apr
21
reviewed Approve suggested edit on Are satellites orbiting around earth visible to the naked eye?
Apr
21
comment Why is the solar system often shown as a 2D plane?
Just to clarify. The definition of inclination is the solid angle between Earth's orbit plane and planet's orbit plane. It does not have anything to do with orientation. So it is clear that Earth's is 0º and others must be less than 90º. Important point is that all are less than 7º. About the sign, it is a common language to mark them as positive if the planet rotates in the same direction Earth does, and negative otherwise.
Apr
3
answered How do you define the diameter of the Sun