The Coolest Star

For those of you that are sick of looking at the hubbel pics.
Sun Data:
Mass 1024 kg
GM x 106 km3/s2
Volume 1012 km3
Volumetric mean radius (km): 696,000.
Mean density (kg/m3): 1408.
Surface gravity (eq.) (m/s2): 274.0
Escape velocity (km/s): 617.7
Ellipticity: 0.00005
Moment of inertia (I/MR2): 0.059
Visual magnitude V(1,0):26.74
Absolute magnitude: +4.83
Luminosity (1024 J/s): 384.6
Mass conversion rate (106 kg/s): 4300.
Mean energy production (10-3 J/kg): 0.1937
Surface emission (106 J/m2s): 63.29
Spectral type: G2 V





Sun Information
from NASA/JPL

The spiny skin Family

I know that this is maybe not so interesting to some, but as I have been working with students teaching science, my interest has bloomed. I have never seen athat is alive.
But upon finding 6 while walking on the beach with my dad, I decided to find out more about them.
When alive sand dollars look like this



they move through the sand with several spines that jet out on the underside of thier bodies



We Have purple see Urichins here on the western northern side of California.

They are really cool.


Sea Stars (formally known as star fish) are also related to the sea urchin and sand dollar. Here are two of my favorites.
The Knobby Sea star with all of its little white medallion pinchers all over.
The leather sea star that smells like rotting garlic and looks like wet suede =)