Hubble constant
At the Largest Scales, Our Milky Way Galaxy is in the Middle of Nowhere
A presentation at the June 6th AAS meeting confirms that our galaxy is inside an enormous cosmic void, the largest…
What are Cepheid Variables?
Discovered in the late 18th century, Cepheid Variable stars have become an important tool for measuring the size of the…
The Hubble Constant Just Got Constantier
A team of astronomers using the Hubble telescope have found that the Universe is expanding more rapidly than thought.
How Are Galaxies Moving Away Faster Than Light?
So, how can galaxies be traveling faster than the speed of light when nothing can travel faster than light? I’m…
Like a BOSS: How Astronomers are Getting Precise Measurements of the Universe’s Expansion Rate
Astrophysicists studying the expansion of the Universe with the largest galaxy catalogs ever assembled are ushering in an exciting era…
Spitzer Provides Most Precise Measurement Yet of the Universe’s Expansion
This graph illustrates the Cepheid period-luminosity relationship, which scientists use to calculate the size, age and expansion rate of the…
Using Gravitational Lensing to Measure Age and Size of Universe
[/caption] Handy little tool, this gravitational lensing! Astronomers have used it to measure the shape of stars, look for exoplanets,…
Hubble’s Law
[/caption] "The distance to objects beyond the Local Group is closely related to how fast they seem to be receding…