# Public

## May 6, 2021

Public Money, Public Code

This is a campaign, by the fsfe. Any code that is developed, with public funds, should be released under a license that makes it available to everyone.

VIDEO

This is the talk from LibrePlanet on PMPC

TAGS

## March 2, 2021

The Hubble Space Telescope: From Cosmological Conflict to Alien Atmospheres

Write up : 7th March 2021

This is a really interesting talk and overview of what the HST has undertaken since launch in 1990.

Some highlights

• Gravitational lensing, found galaxies magnified 50x and detection of galaxies 10x fainter.
• Precision cosmology & Hubble Constant calculations via several methods
• Exoplanet Atmospheres
• Exoplanets e.g 57 Pegasi
• Exoplanets found from transiting host star
• Planetary Atmospheres plus detection of organic molecules
• Earth size Exoplanets (Trappist 1b and 1c)

The talk also makes reference to academic papers, which can be easily searched for, so for example

With the last point in the list above, this paper was De Wit, et al 2016 Nature 537,69 – if you search for this you find arxiv 1006.01103 which is publication in the above journal 2016Natur 537

The 537 refers to the volume, and 69 is the first page of the article, in this case the article is on pages 69 to 72.

So using the references from the talk you can do further reading.

Well worth watching

Space Telescope Science Institute Public lectures The Hubble Space Telescope: From Cosmological Conflict to Alien Atmospheres Tue 2nd March 2021

## February 2, 2021

The Milky Way vs. Andromeda: When Galaxies Collide

Space Telescope Science Institute Public lectures The Milky Way vs. Andromeda: When Galaxies Collide Tue 2nd Feb 2021

## January 19, 2021

The Darkest Secrets of the Universe

Space Telescope Science Institute Public lectures The Darkest Secrets of the Universe Tue 19 Jan 2021

## January 6, 2021

Site Index

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## Y

#YearOfTheFediverse

#Zoo

## December 12, 2020

Active galaxies Review

So following on from the post on December 1st this is a quick review of the active galaxies lecture from the Space Telescope Science Institute.

This lecture, presented by Dr Mitchell Revalski, is really interesting, looking at how supermassive black holes, despite their small size compared to the galaxy they reside in.

Energy from these can push away surrounding gas, and heat this up which reduces star formation as gas needs to cool to form stars.

so scales are pretty huge:

First lets look at what a light year is

Citation : spaceplace.nasa.gov

For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it!


1 pc = 1 parsec = 3.26 light years

Supermassive black hole < 1pc

Bulge = 1 = 3 kpc (kilo parsec)

disk 30 kpc

circumgalactic area 50kpc

So even though these black holes are very small, they have a big influence on what surrounds them.

We know this is happening thanks to the research that led to the 2020 Nobel prize.

Well worth watching and the link is above.

Next lecture 19th Jan – The Darkest Secrets of the Universe Speaker: Raja Guhathakurta (UC Santa Cruz)

## August 25, 2020

Royal Astronomical Society talks Aug 2020

I attended a really interesting talk on Searching for Earth 2.0 with the RAS last week.

A recording is up on their Youtube Channel.

Searching for Earth 2.0

They have a few other talks coming up that may be of interest:-

• Tomorrow 26/8: Lockdown Learning: online preschool level space session

• Thurdsay 27/8: RAS Quilt Project – Online Stitching Session

Further details can be found here

Related but not connected with the RAS