parallax

Astronomy Jargon 101: Parallax

In this series we are exploring the weird and wonderful world of astronomy jargon! You probably don't know how close…

11 months ago

Our Part of the Galaxy is Packed with Binary Stars

Binary star systems are everywhere. They make up a huge percentage of all known solar systems: from what we can…

1 year ago

Cygnus X-1 was the First Black Hole Ever Found. New Measurements Show it's Much More Massive Than Previously Believed

New parallax measurements of Cygnus X-1 by the VLBA find it is more distant than we thought, and therefore more…

1 year ago

Do Stars Move? Tracking Their Movements Across the Sky

The stars look static in the sky, but are they moving? How fast, and how do we know? What events…

5 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

Radio Telescopes Resolve Pleiades Distance Debate

Fall will soon be at our doorstep. But before the leaves change colors and the smell of pumpkin fills our…

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

What is a Parsec?

If you're into astronomy, or just a fan of any science fiction franchise worth its salt, then chances are you've…

9 years ago

Famed Pair of Stars Closer To Earth Than We Imagined

If you're a semi-serious amateur astronomer, chances are you've heard of a variable pair of stars called SS Cygni. When you…

9 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