It’s an interesting idea to use the secrets of the universe to keep your own secrets.
Cosmic Expansion and Tired Light
If light from a distant galaxy is redshifted, and the energy of a photon depends upon its wavelength, doesn’t that mean the photon is spontaneously losing energy? What about conservation of energy?
Another Brick in the Wall
When we look out into the universe, we can see a cosmic background of microwaves in all directions. It’s the thermal remnant of the big bang, but it also serves as a wall beyond which we cannot see. Until now.
Cosmic Ring is Interesting, But Not Impossible
A ring of nine gamma-ray bursts (GRBs) has been observed in the southern hemisphere. The ring is more than 5 billion light years across, which is larger than we’d expect for a cosmic structure. But it’s important not to read too much into this discovery.
Are We Living In A Black Hole?
Here’s an idea, what if the universe and everything we see around us is actually inside a black hole?
The Youngest Distance Galaxy
There’s a new record for the most distant galaxy, or the youngest galaxy depending on your point of view.
Rumors of Our Demise
Part of what makes astronomy so powerful is that it forces us to look beyond our personal cosmos.
How Do We Know Gravity Is Constant?
Could the strength of gravity have been different in the past? How can we tell that gravity has never changed?
Standardizing the Candle
The evidence for dark energy lies in our ability to relate the redshift of a galaxy with it’s distance. To prove dark energy is real we have to measure redshift and distance independently, and that takes a bit of doing.