If your worldline is following the straightest possible path ...

[daltonest1984]

If your worldline is following the straightest possible path through spacetime, then
 
  A) you will be weightless.
  B) you will feel heavier than your normal weight.
  C) you must be accelerating.
  D) you must be traveling at constant velocity.

Question 2

What did COBE find regarding the smoothness of the cosmic background radiation?
 
  What will be an ideal response?

[akemokai]

Answer to Question 1

A

Answer to Question 2

COBE found that the cosmic background radiation has a perfect thermal radiation spectrum, with a peak corresponding to a temperature of 2.73 K. However, it also found slight fluctuations in the radiation. The temperature varies very slightly from one place to another by a few parts in 100,000.

[daltonest1984]

Gracias!

[bassamabas]

Excellent