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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
Apr
2
comment Layout of the universe
Please explain exactly what are you referring to. Shape? Distribution of matter? Size? Connectivity?
Mar
25
comment A curious relationship between lunar periods and the solar year
Now it makes all the sense :) Thanks
Mar
25
comment Galactic Habitable Zone
Besides Gamma Ray Bursts ;)
Mar
25
answered Is there a fundamental difference between a small galaxy, and a large star cluster?
Mar
25
comment A curious relationship between lunar periods and the solar year
I do not manage to understand how nor why a relation between sidereal and synodic MONTHS gives up the duration of the sidereal YEAR.
Mar
10
comment What is the orientation of planetary orbits?
Orbital elements "Inclination", "Longitude of the ascending node" and "Argument of periapsis" would not be necessary if the planets orbits were coplanar and alligned, isn't it? Planets would always be over the ecliptic in sky if their orbits were coplanar, isn't it? There would be no precession of the perihelion of Mercury as predicted by General Relativity if major axis were aligned, isn't it? Just go out of the shell and see.
Mar
7
comment What is the orientation of planetary orbits?
Which kind of reference do you want?
Mar
7
answered What is the orientation of planetary orbits?
Mar
7
answered Is it possible to be 'still' in space?
Mar
6
awarded  Nice Answer
Mar
4
answered What will happen to life on Earth when Andromeda and Milky Way galaxies collide?
Feb
28
answered What is the speed of light relative to (in space)?
Feb
27
reviewed Approve suggested edit on Can an amateur astronomer bounce a laser off the moon?
Feb
25
answered What is Event Horizon of a Black Hole?
Feb
21
comment How can I calculate the orbital periods in a binary star system?
Ok, but now that you have Egglescliffe document, please read it and answer your own question. Or if there is something specifically you do not understand of it, ask for that specific issue.