How do we determine the conditions that existed in the very early universe?
A) We can only guess at the conditions, since we have no way to calculate or observe what they were.
B) The conditions in the very early universe must have been much like those found in stars today, so we learn about them by studying stars.
C) We work backward from current conditions to calculate what temperatures and densities must have been when the observable universe was much smaller in size.
D) We look all the way to the cosmological horizon, where we can see the actual conditions that prevailed all the way back to the first instant of the Big Bang.
C
You might also like to view...
The oldest pulsars are billions of years old
a. True b. False Indicate whether the statement is true or false
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A.
An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground
At what horizontal distance away from the target should the package be released so that it lands on the target? A) 2.55 km B) 125 m C) 326 m D) 786 m E) 1.22 km
What two regions of the electromagnetic spectrum are best utilized by ground-based astronomers, and why?
What will be an ideal response?