spacetime articles
What mysterious, pervasive repulsive force is attributed to the accelerating expansion of the universe?
What was the prevailing expectation regarding the expansion initiated by the Big Bang before 1998 observations?
How is the observation that distant galaxies recede faster than light reconciled?
What happens to light emitted *now* by a galaxy whose recession velocity exceeds the speed of light due to expansion?
What astronomical objects act as dependable "standard candles" for measuring vast cosmic distances?
What concept quantifies the disagreement between two primary ways of measuring the current expansion rate?
Which observation allows physicists to predict the Hubble constant based on the very early universe within the $\Lambda$CDM model?
If a supernova in a distant, rapidly receding galaxy should take time $T$ to fade, how long do observers see it take?
What is the predicted fate of the universe if dark energy causes expansion but does not become overwhelmingly powerful?
In the catastrophic Big Rip scenario, what is the final structure to be torn apart by infinite expansion?