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Space Facts: Part 5 - Amazing Moons, Ultra Dark Galaxies, Moon quakes

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1. Amazing Moons:

Ganymede, Europa and Callisto are moons of Jupiter where it is believed that these moons contain Frozen Water. Enceladeus moon of Saturn is believed to have Hot Water springs on its surface due to very high surface temperature of moon.

2. Ultra Dark Galaxy:

800 ultra dark galaxies are found in Coma Cluster of Galaxies. Coma Cluster contains only 1/1000 times the stars than that of our galaxy. The component visible matter, such as stars is only 1% of total mass of each galaxy, the rest mass is made up of Dark Matter.

Blackhole of 140 Million times the mass of Sun is discovered in NGC 1097 Galaxy.

3. What are Moon-quakes ?

By studying the scientific data from Chandrayaan 1 mission of ISRO, scientists belive that the crust of moon is also made up of plates just like Earth.
Earlier NASA scientists believed that Moon-quakes were caused by rocks beneath the surface of moon. The temperature difference of day and night of Moon is very high due to negligible Moon Atmosphere. This high temperature difference creates cracks in rocks, after long period of time the cracks widens and rocks break, resulting in Moon-Quakes.

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