Exposing PseudoAstronomy

October 18, 2017

Podcast Episode 166: Stellar Evolution, Age of the Universe, and Young-Earth Creationism


Star evolution,
Age of the universe, and
Creationism.

Young-Earth Creationism strikes again and this time misuses error bars to argue that GodDidIt. The episode covers a science paper that discussed the age of a very old star which was derived to be a bit older than the universe. But, add in the appropriate error bars, and potentially a correction to its color, and there’s absolutely no issue whatsoever. But, try telling that to a creationist with an agenda. There’s only a very brief singular additional segment in this episode.

M15 from HST

The dazzling stars in Messier 15 look fresh and new in this image from the NASA/Hubble Space Telescope, but they are actually all roughly 13 billion years old, making them some of the most ancient objects in the Universe. Unlike another recent Hubble Picture of the Week, which featured the unusually sparse cluster Palomar 1, Messier 15 is rich and bright despite its age. Messier 15 is a globular cluster — a spherical conglomeration of old stars that formed together from the same cloud of gas, found in the outer reaches of the Milky Way in a region known as the halo and orbiting the Galactic Centre. This globular lies about 35 000 light-years from the Earth, in the constellation of Pegasus (The Flying Horse). Messier 15 is one of the densest globulars known, with the vast majority of the cluster’s mass concentrated in the core. Astronomers think that particularly dense globulars, like this one, underwent a process called core collapse, in which gravitational interactions between stars led to many members of the cluster migrating towards the centre. Messier 15 is also the first globular cluster known to harbour a planetary nebula, and it is still one of only four globulars known to do so. The planetary nebula, called Pease 1, can be seen in this image as a small blue blob to the lower left of the globular’s core. This picture was put together from images taken with the Wide Field Channel of Hubble’s Advanced Camera for Surveys. Images through yellow/orange (F606W, coloured blue) and near-infrared (F814W, coloured red) filters were combined. The total exposure times were 535 s and 615 s respectively and the field of view is 3.4 arcminutes across.

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October 1, 2017

Podcast Episode 165: Little Things in Space


Microgravity,
True or near vacuum pressures,
Temperature in space.

A long-planned episode that gets back to the roots of ferreting out misconceptions (though three tied together): Little Things in Space!!! This episode, if you couldn’t get it from the haiku, covers the concept of microgravity, vacuum, and temperature (what does temperature mean if there’s nothing there to experience it?). There are no additional segments.

Thermometers

Thermometers

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