Answer to Question 1
Interstellar dust obscures most of the light from the galactic center and blocks light from many parts of the disk. Until modern telescopes were able to look at other parts of the electromagnetic spectrum, the galaxy could not be studied and understood in detail.
Answer to Question 2
Speed is the pace at which an object moves through a distance (regardless of direction).Velocity is the pace at which an object moves through a distance, including a specific direction. Acceleration is the rate at which an object's velocity changes. The distinguishing feature between speed and velocity is that speed does not include a direction, whereas velocity specifies a direction.
Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l
Northern Lights on a Clear Winter Night
This chart illustrates the “drip down” model of government. In this, politics is formed by the soc
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Items that would be difficult to replace bearing legal significance are sent by certified mail.
Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx.