- #1
sithe
- 7
- 1
Morning everyone,
We know of some illusions in our everyday experience, such as an echo making us believe someone is talking back at us, or mirages in the desert, or mirrors making us think there are two symmetric objects when one is only the reflection of another.
I was wondering about such illusions in cosmology. I know of two, when we look at a star whose light has been distorted by gravity, we might think the star is in one place when it is actually in another. Also we sometimes see two galaxies when there is actually one galaxy because of the distorting effect of dark matter.
How do we account for such possibilities / anomalies when doing measurements in cosmology, e.g. when looking at radiation from distant galaxies / stars / objects. Or even when looking at complex things like cosmic background radiation etc.
Thank you for any insight you can give.
Sithe
We know of some illusions in our everyday experience, such as an echo making us believe someone is talking back at us, or mirages in the desert, or mirrors making us think there are two symmetric objects when one is only the reflection of another.
I was wondering about such illusions in cosmology. I know of two, when we look at a star whose light has been distorted by gravity, we might think the star is in one place when it is actually in another. Also we sometimes see two galaxies when there is actually one galaxy because of the distorting effect of dark matter.
How do we account for such possibilities / anomalies when doing measurements in cosmology, e.g. when looking at radiation from distant galaxies / stars / objects. Or even when looking at complex things like cosmic background radiation etc.
Thank you for any insight you can give.
Sithe