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Dec
12
comment Was comet ISON in a Kepler orbit prior to disintegrating?
The orbit of the body is, indeed, affected by the loss of mass. You are comparing two bodies of different mass, not a body which is losing mass. When a body loses mass, the orbit is still valid for the center of mass of the disgregated body, which does not necessarily coincide with the "main" remaining body.
Dec
12
answered Is the Jupiter-Sun system considered a binary system of some type?
Dec
12
comment Where does the radiation in space come from and can we observe it?
Could you make a mention to Gamma Ray Bursts? If they happen near enough they can be dangerous too.
Dec
12
awarded  Custodian
Dec
12
reviewed Edit suggested edit on Why do the planets in the Solar system stay in the same orbital plane?
Dec
12
revised Why do the planets in the Solar system stay in the same orbital plane?
added emphasis
Dec
12
answered Why do the planets in the Solar system stay in the same orbital plane?
Dec
12
comment How to calculate Longitude from Right Ascension?
You need a clock. Do you have one for this exercise?
Dec
11
comment Is there any telescope on Earth that can see the lunar rovers on the moon?
To add to @Eduardo Serra's answer, you can avoid having a 75m diameter telescope if you use interferometry between telescopes 75m apart.
Dec
11
comment How can the Earth's rotation speed up?
It is not the amount of water, but the fact that water is moving around the Antarctica and has its own angular momentum. Total angular momentum of the Earth is conserved, so if you speed the water flowing in the same direction as the planet rotates, the planet slows down.
Dec
11
comment How can the Earth's rotation speed up?
Yes, I realized the typo
Dec
11
answered Official registry of lunar placenames?
Dec
11
revised How can the Earth's rotation speed up?
Typo
Dec
11
comment How can the Earth's rotation speed up?
@Fabinout fluid bodies like Earth or a balloon filled with a mixture of water and oil will undergo changes in their mass distribution, and any mass redistribution will change rotational speed due to constant angular momentum.
Dec
11
answered How can the Earth's rotation speed up?
Dec
9
comment How would we detect an Earth doppelganger planet?
@called2voyage IF there were such a planet close enough to detect, it would be one of our Solar System, so it would have been detected long ago. We can not detect them nowadays (nor in any near future), as explained by jwenting
Dec
9
comment How to measure the altitude and azimuth of a star?
Yes, 90-alt is the Zenith distance of the star, which is precisely dec-lat (or lat-dec).
Dec
9
answered How to measure the altitude and azimuth of a star?
Dec
9
answered Is the rotation of the Sun and the rotation/orbit of the Moon around the Earth a coincidence?
Dec
9
revised How do you figure out the magnitude of stars?
Opsss... wrong numbers!