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Astronomer Carl Sagan leads us on an engaging guided tour of the various elements and cosmological theories of the universe.

Initially developed and released by Gearbox Software in 2001, second Half-Life (1998) add-on, Half-Life: Blue Shift (2001) is a return to the Black Mesa Research Facility and another look at the Incident's consequences from the eyes of Gordon Freeman's best friend - Barney Calhoun.

Arvin borrows NASA's ISX Enterprise space ship to visit a large black hole. He then persuades one of his adventurous crew members, Adam, to hop in. Arvin describes what the rest of the crew sees happen to Adam and why. Then he describes Adam's experiences and why he sees what he does. Adma's survival depends on which theory of gravitation you choose to believe.

Joe responds to viewer questions about daylight savings time, expansion of the universe, right to privacy, quantum-classical behavior transitions, hardware versus software and the Thwaites glacier all of which he's unqualified to answer but gives it the old college try.

Almost all galaxies in the universe are moving away from the Milky Way thanks to the Big Bang and dark energy. Here are the stories of the few exceptions. Some nearby galaxies are approaching us simply by chance. A few are being attracted by gravity and will eventually merge with the Milky Way. There are also some distant galaxies in the Virgo cluster that alternate between approaching and receding from the Milky Way as they rapidly rotate around the cluster.

The first ever measurement of the proper motion of the Andromeda galaxy confirmed it is heading for a collision with the Mily Way in about four billion years.

Messier 84 is a large nearby galaxy that has been closely studied in multiple wave lengths helping astronomers understand how a galaxy's central super massive black hole regulates star formation.

The spiral galaxy Messier 106 has an actively accreting black hole at is core putting it in a class known as Seyfert galaxies. This galaxy is also generating a beam of microwaves toward Earth that enables Astonomers to measure the galaxy's distance very accurately.

Messier 42 is a single young B type star whose stellar wind has cleared a cavity in its own nebula and may have created a shock wave that is colliding with the Orion nebula unleashing a wave of O type star formation.

The Black Eye galaxy, Messier 64, was pivotal in the understanding of spiral galaxy evolution with some major surprises.

The Beehive is a young open cluster that happens to contain the first exoplanets discovered in a star cluster.

Mike Benz describes the military rule, The national security state is the main driver of censorship and election interference in the United States.

A team headed by Thomas Martin produced a three dimensional map from spectra of the Crab Nebula which Mike couldn't resisted incorporating into one of his famous glass cubes. He shares his cube along with an explanation of the structure of the nebula.

In an analysis of the red and blue shifts of 263 galaxies images\d by the JWST Lior Shamir reported that the galaxies has a two to one preferred direction of rotation. Anton explains the way this observation could be caused by observational error but, if true, how some interesting physics might make it happen.

A study of the change on the red/blue-shift of nearby Barnard's star indicates there are four terrestrial planet in close orbit around if. Unfortunately, a few years ago Barnard's star was found to be subject to major flares so it is unlikely life survive on any of them.