The Supernova 1994D

nature | Night Life | by Joshwallace | http://ift.tt/1IeKeUi

The first two images are tesseracts and the second two are 4D spheres. 1 Dimension: in a universe with one dimension, particles can only move in a line so from left to right not up and down. _____________________________

2 Dimensions: this is made up of an infinite amount of 1D universe and particles would be able to to move in two dimensions, up down left and right. Now if there was an organism living in a 2 dimensional it would see things in 1 dimension just like we see things in 2 dimensions and our brain is what is able to interpret depth by using two eyes and our brain. When we hold our finger in front of our face and move it, we can see that it appears to have moved relative to the background. Our brains see this difference and this allows us to estimate how far away they are. In a 2D universe there would be no background as such to see the “finger” moving against so it would be seen in 1D although it’s impossible to visualise anything in 1 dimension.

3 Dimensions: we live in 3 spatial dimensions in our universe which is made up of an infinite amount of 2D universes. We see things in 2 dimensions. A common misconception is that time is the 4th dimension but it doesn’t really make sense because it is present in every spatial dimension.

4 Dimensions: this is almost impossible to try and visualise. There are some people who claim they can think in 4 and even more dimensions. Now, a 4th dimensional organism would see things in 3 dimensions. If they came to our universe then they would be seeing absolutely every line of every shape but it wouldn’t be possible for a 4D being to like in 3D, it would be like us living in 2D. Above I have some 4D shapes to give you an idea of how we can represent them. It’s better to watch the inks though.

http://youtu.be/-x4P65EKjt0 http://youtu.be/5BF-ygCbmD8

Interstellar bow

A photo of S Rings, a ring near Saturn. Took by Cassini with COISS on March 04, 2013 at 08:56:39. Detail page on OPUS database.

Disclaimer: These are online resources that I have found, They are not meant to be your only source of study, instead you can use them to your enhance your normal study. I don’t know what level these resources are aimed at, but I’ve tried to provide a range for a number of different topics. I don’t study Physics, so I don’t know how accurate these are, or how they relate to course syllabi.

Space & the universe:

How do we know the Big Bang actually happened?

Visible Earth - A catalogue of satellite images of our home planet detailing everything from atmospheric data to city lights or natural disasters.

NASA - NASA homepage with links to other NASA sites. FAQ

British National Space Centre - Site containing information about current satellites launches, solar system and Earth observation. There are links from the ‘Learning Zone’ to other Space sites.

Online Physics Lecture Notes - A directory of online undergraduate level astronomy and physics lecture notes from various universities.

Physics in Perspective: 2013 lectures - Video: Dr Andreas Freise talks about finding black holes with lasers.

Galileo: An educational film - An educational film dramatising the life of Galileo and his scientific discoveries.

Why our universe might exist on a knife-edge

Is our universe the only universe?

Distant time and the hint of a multiverse

The hunt for a supermassive black hole

The story behind the Mars Rovers

The design of the universe

Shedding light on dark matter

Why did Pluto get kicked out of the planet club?

Geocentrism and heliocentrism

Newton’s Law of Universal Gravitation

An overview of orbital mechanics

Orbital mechanics -  These drawings simplify the physics of orbital mechanics, making it easy to grasp some of the basic concepts.

Gravity is More Than a Name

Circular and Satellite Motion Interactives

Vectors, Motion & Momentum

Vectors - Motion and Forces in Two Dimensions

Vectors, Projectiles, and 2-D Motion Interactives

One dimensional motion - velocity, speed, time, acceleration, projectiles.

Two dimensional motion - projectile velocity, inclines, centripetal force and acceleration.

Introduction to vectors and scalars - Khan Academy  (YouTube)

Physics: Introduction to Vectors (YouTube)

Momentum and Its Conservation

Momentum and Collisions Interactives

1-D Kinematics Interactives

The simple pendulum - Excellent animations proving assorted points about the simple harmonic motion approximation for pendulums.

The Physics of Body Mechanics

Momentum and forces (BBC Bitesize)

Forces and Newton’s laws

Impacts and linear momentum

Moments, torque and angular momentum

Oscillatory motion

Work & Energy:

Work, Energy, and Power

Work and Energy Interactives

Introduction to work and energy - Khan Academy

SparkNotes: SAT Physics: Work, Energy, and Power

Thermal Physics:

Thermal Physics

Thermodynamics

SparkNotes: SAT Physics: Thermal Physics

Thermal Physics - Heat and Temperature (YouTube)

Electricity & Magneticism:

Static Electricity

Static Electricity Interactives

The Electromagnetic Spectrum Song by Emerson & Wong

Electromagnetic Spectrum - Introduction

Electricity and magneticism (Khan academy)

Current Electricity

Magnetism Interactives

Direct Current Versus Alternating Current

Circuits

Circuit symbols review notes

Circuit components overview

Resistors in Circuits

Batteries in Circuits

Capacitors in Circuits

Online circuit lab

Electric Current

Electric Resistance

Electric Power

Light & Sound:

Waves

Waves and Sound Interactives

Sound Waves and Music

Mechanical waves and sound

Light Waves and Color

Light waves

Reflection and the Ray Model of Light

Refraction and Lenses Interactives

Refraction and the Ray Model of Light

Circles of light: the mathematics of rainbows - An in-depth study of the mathematics involved in the study of rainbows. For advanced students only.

The Discovery Of Radioactivity - 100 years ago, a group of scientists unknowingly ushered in the Atomic Age. Their work initiated paths of research which changed our understanding of the building blocks of matter.

Light: Particle or a Wave?

Refraction of Light

Diffraction of Light

Sources of Visible Light

Laser Fundamentals

Prisms and Beamsplitters

What is the speed of dark? Vsauce. YouTube (2014).

Primary Colors

Diffraction of Light

Atoms:

The Discovery and Research on the Atom - A description of some of the important developments in understanding the atom an its constituents. Some parts of the site are very mathematical and go beyond college level physics.

Large Hadron Collider finds elusive new particle after 50 years

Building atoms

Revise atom structure (S-cool, intro level)

Build an atom - Move the electrons, protons and neutrons yourself to create different atoms.

Definitions & Tools:

Torques - Definitions of various torques, statements of Euler’s equations.

Elasticity - Definitions for a selection of topics related to elasticity.

Forces - Glossary of terms and mathematical derivations for various forces.

Friction - A few good definitions relating to friction.

Mass and Weight - Brief definitions for various mass and weight related topics.

A Dictionary of Units of Measurement - The history and conversion of different numeric systems

Physics Forums - A busy forum covering every physics topic under the sun. Great for everything from homework questions to discussing the origins of the universe.

The Laws List - The Laws List is an alphabetised guide featuring several hundred laws, rules, principles and other related topics in physics, from aberration to the Zeeman effect.

Astro Physical Calculator - A fully working physical calculator with physical constants stored in memory.

Other:

Introduction to MRI physics - A detailed page on the workings of mri scanners with lots of animations (requires shockwave).

How Does a Cat Land on its Feet? - The saying is that cats always land on their feet. This animation explains how they do this.

X‑rays

What physics taught me about marketing

Physics Timeline

Careers:

Careers in physics

What can I do with my degree in physics?

Careers In Physics - American Physical Society

Important Dates and Discoveries - The Physics of the Universe

What’s Up for September?

Stargazing and looking up into the night sky is always a fun thing to do. This month, it will be especially exciting because there will be a total eclipse of a supermoon, plus the opportunity to see planets and the late-summer Milky Way!

What is a supermoon?

A supermoon is a new or full moon that occurs when it is at, or near its closest approach to Earth in a given orbit. There are usually 4 to 6 supermoons every year.

Observers can view the total eclipse on September 27, starting at 10:11 p.m. EDT until 11:23 p.m. This event will be visible in North and South America, as well as Europe and Africa. So make sure to mark your calendars!

This month, you will also be able to see the planets! Look for Mercury, Saturn, Pluto and Neptune in the evening sky. Uranus and Neptune at midnight, and Venus, Mars and Jupiter in the pre-dawn sky.

Finally, if you’re able to escape to a dark location, you might be able to see a great view of our Milky Way!

So, make sure to get outside this month and take a look at everything our night sky has to offer.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Jupiter in infrared light, as seen by NASA’s InfraRed Telescope Facility (IRTF). The observations were obtained in support of NASA’s Juno mission by a team headed by Juno scientist Glenn Orton.

The Milky Way in a beautiful photo by Luca Cruciani

http://angelwolf92.deviantart.com/

New Video! What is an Elliptical Galaxy?

Follow Evanthorizon for more astronomy posts!