Answer: is constant
Explanation:
In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.
Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.
This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.
Answer:
Here are the list...
Explanation:
Community Colleges
Borough of Manhattan Community College
Bronx Community College
Guttman Community College
Hostos Community College
Kingsborough Community College
LaGuardia Community College
Queensborough Community College
4-Year Colleges
Baruch College
Brooklyn College
City College of New York
College of Staten Island
Hunter College
John Jay College of Criminal Justice
Lehman College
Medgar Evers College
New York City College of Technology
Queens College
York College
Honors College
CUNY William E. Macaulay Honors College
Graduate Colleges
CUNY Graduate Center
CUNY Graduate School of Journalism
CUNY School of Law
CUNY School of Medicine
CUNY School of Professional Studies
CUNY School of Public Health
State University of New York
Fashion Institute of Technology
SUNY College of Optometry
SUNY Downstate Medical Center
SUNY Empire State College (The Harry Van Arsdale Jr. Center for Labor Studies)
SUNY Maritime College
Check out on Wikipedia
Answer:
The Hadean eon represents the time interval between 4.6 billion to 4 billion years back. It is marked by the initial formation of the earth , right from the time of gathering and accumulation of interstellar dust particles and gases, and there was frequent collision between the planetesimals of relatively larger in size. The core and the crust formed and started to become stable and also gradually led to the formation and expansion of the ocean and the earth's atmosphere.
This is how the earth gradually started to form and develop and took the shape during the time interval between 4.6 billion to 4.2 billion years old, and where the oldest rocks found on earth is dated from about 4.2 billion years in the past.