Telescopes are, in a way, time-travel machines to the distant past & faraway galaxies when our Universe is still very young.
Mar 29th: Teenage Galaxy Found Hiding in a Cosmic Nursery
Tag: universe
Feb 18th: Are There Invisible Stars in the Universe
What is an axion? How could axions make a star, and what does that have to do with dark matter? What would these stars look like?
Nov 25th: Homogeneity
As astronomers discovered that we live in a great big universe, they considered a fundamental question: is the Universe the same everywhere?
Aug 20th: Is the Universe Making Any New Galaxies?
Jul 30th: What is the Universe Expanding Into?
Many of you consistently ask: If the Universe is expanding, then what is it expanding into?
Jul 2nd: Where is the Center of the Universe?
What does it mean for the Universe to have a center? Could we ever travel to ours? What is a singularity?
Jun 18th: Does the Universe Get Shorter When You Go Faster?
How does length contraction work in relativity? Do moving objects really get shorter? What about from their perspective? How are we supposed to make sense of any measurement?]
Mar 19th: Will Our Universe End in a Big Rip?
How can a “big rip” tear the Universe apart? What does that mean for existence itself? Is it going to happen, and what are we doing to find out? I discuss these questions and more in today’s Ask a Spaceman!
Dec 1st: The Universe is (Still) Trying to Murder Us
In today’s episode, we’re going to look at everything from how past Earth couldn’t support photosynthesis because the days were just too short, to current Earth letting us get hit by more Cosmic Rays prior to Earthquakes going off, and to supernovae threatening our world while alien stars eat other planets.
Aug 22nd: Only So Much
It’s a big Universe, even Mars is far away. You can’t have everything.