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Layer-6 “application” layer abstracts data accumulated by Layer-4 “data accumulation” layer.

In the 7-layer IoT architecture, what of the following statement about the layer-2 “networking and connectivity” layer is correct?

Large companies are forming vertical alliances with stakeholders of different levels, thus are causing somewhat fragmented markets that are not compatible with each other between the big companies.

Saturn is less dense than water. 

Neutron stars are more massive than black holes.

Extra Credit: The definition of a compound is:

The Hertzsprung-Russell diagram plots stars according to:

Precession of Earth’s axis has a cycle of about:

Which galaxy is expected to collide with the Milky Way in several billion years?

A group of stars forming a recognizable pattern in the night sky is called a