distance

At cosmic distances, even the speed of light is really slow

The speed of light is the absolute fastest thing in the universe, clocking in at a whopping 299,792,458 meters per…

2 years ago

How Far Back Are We Looking in Time?

When we look out into space, we're also looking back into time. Just how far back can we see? The…

7 years ago

How Do We Know How Old Everything Is?

We hear that rocks are a certain age, and stars are another age. And the Universe itself is 13.7 billion…

8 years ago

How Do We Measure Distance in the Universe?

This star is X light-years away, that galaxy is X million light-years away. That beginning the Universe is X billion…

8 years ago

GAIA is “Go” for Science After a few Minor Hiccups

In astronomy we throw around the term "light-year" seemingly as fast as light itself travels. And yet actually measuring this…

8 years ago

If the Moon Were Only One Pixel: a Scale Model of the Solar System

One of my favorite pet peeves is the inability of conventional models to accurately convey the gigantic scale of the…

8 years ago

Orion Revisited: Astronomers Find New Star Cluster in Front of the Orion Nebula

The well-known star-forming region of the Orion Nebula. ¬†Credit: Canada-France-Hawaii Telescope / Coelum (J.-C. Cuillandre & G. Anselmi) Precise distances…

10 years ago

How To Measure the Universe

Measuring distance doesn't sound like a very challenging thing to do -- just pick your standard unit of choice and…

10 years ago

Distance to Alpha Centauri

Alpha Centauri is the closest known star system to the Solar System. Also known as Rigil Kentaurus, Alpha Centauri is…

13 years ago

Stellar Parallax

[/caption] Parallax is the apparent difference in the position (line of sight to) an object, when the object is viewed…

13 years ago