Answer:
there are more cells in all humans than the number of meters across the Milky Way
Step-by-step explanation:
Here we are told that 1 light year is equivalent to:
[tex]1ly=10^{16}m[/tex]
We also know that the diameter of the Milky Way is
[tex]d=100,000 ly[/tex]
Therefore, the diameter of the Milky Way in meters is:
[tex]d=(100,000)\cdot (10^{16})=10^5\cdot 10^{16}=10^{21}m[/tex]
On the other hand, the world population is about 7 billion:
[tex]p=7\cdot 10^9[/tex]
Every human body has about 37 trillion cells, which corresponds to
[tex]n=37\cdot 10^{12}[/tex]
Therefore, the total number of cells in all humans is
[tex]N=np=(37\cdot 10^{12})(7\cdot 10^9)=2.6\cdot 10^{23}[/tex]
The second number is larger: therefore, there are more cells in all humans than the number of meters across the Milky Way.
