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location Santa Ana, CA
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1d
reviewed No Action Needed In 2016, the summer solstice will coincide with a full moon. How often does this happen?
1d
reviewed Leave Open Evidence behind Giant Impact hypthesis
2d
comment Mass of sun's core
Change in what over the change in density?
Oct
23
comment Mass of sun's core
Actually, I was justifying yours. But remember, the density between 20% and 25% is a lot less than that below 20% so the mass wouldn't double.
Oct
23
comment Mass of sun's core
Which numbers are you confused about?
Oct
23
comment Mass of sun's core
With 0.25 radius, the volume is 0.0156 the total volume, which is 1.56%. If 0.8% is 34% of the mass, than 1.56% should be 50% of the mass. Now all that is needed is a probe to determine if it is 20% or 25% of the radius.
Oct
22
answered Mass of sun's core
Oct
22
revised Mass of sun's core
Provided references
Oct
22
asked Mass of sun's core
Oct
21
reviewed No Action Needed Where can I find a catalog of all stars in the Milky Way?
Oct
21
comment Appropriate battery for overnight viewing to drive telescope and GOTO?
@WayfaringStranger Deep Cycle Batteries are usually not sealed since water needs to be added frequently. Also, they usually have much more than 10 Ah. This is what I was refering to: batterysharks.com/12-Volt-7-2-Amp-Sealed-Lead-Acid-Battery-p/…
Oct
19
revised How near to Earth do comets pass?
added 1 character in body
Oct
19
comment How near to Earth do comets pass?
@LocalFluff You're right, they are not all comets, but the only difference between a comet and an meteor is whether it makes a tail.
Oct
19
answered How near to Earth do comets pass?
Oct
19
reviewed No Action Needed What would be the dynamics of a double-planet system, similar to Earth / Moon, but with both bodies nearly Earth-sized?
Oct
18
reviewed No Action Needed Do all stars have an oort cloud or is it a rare occurance?
Oct
18
reviewed Reviewed How do we know that the speed of the influence of gravity is instant?
Oct
16
comment length of Star lifetime
It depends on the mass of the star if a helium flash occurs. There is a question about the death of a star that has some good references. Also, you should do your own search on a star's life and death.
Oct
14
answered length of Star lifetime
Oct
12
reviewed Looks OK Is the whole universe is rotating on an axis?