# Pastricis reditus

Nulla major laetitia quam inexspectata. Hodie per rete vagans in paginam Pastricis incidi, quem adhuc tacentem rebar, et nonnullos recentiores commentarios ibi invenio! Et ibi non est Pastrix deminutus, sed, si contumelias in Sarkozium legimus, totus est Pastrix! De quo valde gaudeo.

Simul de Nemine notitiam invenio (quem etiam ego frustra quaesieram), atque doceor illum amicum pravam cujusdam puellae lectionem et inde nonnulla incommoda passum esse; quae mihi ferme ejusdem modi passo inde detulerunt, ut certos exararem commentarios, aut de quibusdam rebus opinarer.

Etiam ibi sententias lego Caputsaxientis, Reginae Noctis, ceterorum... Invenisse videor veteres amicos...

## 3 comentarios

Ludovicus -

Thersites -

Ludovicus -

http://www.youtube.com/watch?v=5PkLLXhONvQ&feature

SPECIAL RELATIVITY

Römer measured the speed of light,

and something basic just wasnt right.

because Michaelson and Morley

showed that aether fit data poorly.

We jump to 1905.

In Einsteins brain, ideas thrive:

The laws of nature must be the same

in every inertial frame

We all believe in relativity, relativity, relativity.

Yes we all believe in relativity, 8.033, relativity.

Einsteins postulates imply

that planes are shorter when they fly.

Their clocks are slowed by time dilation,

and look warped from aberration.

Cos theta-prime is cos theta minus beta ... over one minus beta cos theta.

Yes we all believe in relativity, 8.033, relativity.

With the Lorentz transformation,

we calculate the relation

between Chriss and Zoes frame,

but all invariants, they are the same.

Like B dot E and B-squared minus E-squared,

... and the rest mass squared which is E-squared minus p-squared.

cos we all believe in relativity, 8.033, relativity.

Soon physicists had a proclivity

for using relativity.

But nukes made us all scared

because E = mc2.

Everything is relative, even simultaneity,

and soon Einsteins become a de facto physics deity.

cos we all believe in relativity, 8.033, relativity.

GENERAL RELATIVITY

But Einstein had another dream,

and in nineteen sixteen

he made a deep unification

between gravity and acceleration.

He said physics aint hard at all

as long as you are in free fall,

cos our laws all stay the same

in a locally inertial frame.

And he called it general relativity, relativity, relativity.

And we all believe in relativity, 8.033, relativity.

If towards a black hole you fall

tides will make you slim tall,

but your friends wont see you enter

a singularity at the center,

because it will look to them

like you got stuck at radius 2M.

But you get squished, despite this balking,

and then evaporate, says Stephen Hawking.

We all believe in relativity, relativity, relativity.

Yes we all believe in relativity, 8.033, relativity.

Were in an expanding space

with galaxies all over the place,

and weve learned from Edwin Hubble

that twice the distance makes redshift double

We can with confidence converse

about the age of our universe.

Rival theories are now moot

thanks to Penzias, Wilson, Mather & Smoot.

We all live in an expanding universe, expanding universe, expanding universe.

Yes we all live in an expanding universe, expanding universe, expanding universe.

But whats the physics of creation?

Theres a theory called inflation

by Alan Guth and his friends,

but the catch is that it never ends,

making a fractal multiverse

which makes some of their colleagues curse.

Yes theres plenty left to figure out

like what reality is all about about.

but at least we believe in relativity, relativity, relativity.

Yes we all believe in relativity, 8.033, relativity.