Kay asks

How can a star become small and dense enough to become a black hole? My understanding is that a...

Michel Lamontagne from Edmonton asks

Why does sound get through a surface like a wall better than light? If you use a curtain they both...

Mauro Mavrinac from Ottawa asks

Given: a horizontal rigid tube with one end on an axis at a constant rotation. Insert a solid ball...

Elise asks

I have done lots of research on auroras and I understand almost every thing about them. The basic...

Jayde from Surrey asks

What is the field of cryogenics? What kind of occupation is available in cryogenics?

Ben from the Internet asks

What exactly are Proton Spin Numbers, and how can you have a non-integer proton spin number?

Linda Sanders from Catonsville MD asks

Why does my coffee flow more freely from a to-go cup when there are two holes in the lid instead of...

Pablo Ros asks

I have been charging a leyden jar with an electrophorous (pieplate and cup) and was wondering how...

Fern Marques from North Bay, Ontario asks

How can planetary angular momentum be tranferred from one body (Earth's rotation) to another...

Shane Harrison from England asks

I was watching a short documentary on how the Earth first came about. The part that was puzzling me...

Liz Morice asks

What makes the aluminum powder in an Etch-A-Sketch stick to the glass to make an image?

Sarah Bosquet from Issoudun asks

I'm writing a science-fiction novel and need information about black holes, gravitation and...

Steve T from Kingston, ON asks

Light is refracted because its speed decreases when it enters a denser medium. Why does it speed...

Furqan from Lahore asks

Why don't ordinary Silicon diodes emit light like LED's?

Shayne Paterson from Lincolnshire, UK asks

I am currently researching EMP for a essay at my college. My essay is looking at possible...

Dr. X from Cornberry asks

I have made a theoretical discovery in my studies. It concerns vibrations of frame of reference in...

M Harish from Mumbai asks

Why does a bar magnet repel when it breaks?    n====|====s

Matt from Ottawa asks

Knowing the basic functions of magnets (dipoles, domaines...) I still don't understand WHY two...

Gabby Stec from Harrisburg asks

Why, specifically, do ferrite magnets gain strength in low temperatures?

Daniel Eyre asks

How far is Pluto from the sun, and will we ever be able to travel to other planets, besides the...

Steve Rock asks

I'd like to model magnetic fields on my computer, but I can't find any software. Can you point me...

Abhinav from Delhi asks

Why do all planets revolve in elliptical orbits around the sun? I mean in nature there existis...

Cristina asks

How far is the Sun from Pluto? How long does it take for sunlight to travel to Pluto?

missy cunningham from portsmouth asks

Every time we go to our local grocery store and get a buggy that does not have a chain hanging from...

Zambi Donburi from Brisbane, Australia asks

Is it true that no mass can travel at the speed of light? If this is true, as you are nearing the...

Saurabh from New Delhi asks

Gravity can produce motion in a body. Thus, it does work. But, for doing work, energy is needed....

Kiana Stewart from Blacksburg asks

If Virginia sees a full moon in the daytime then do places like Australia see no moon at night?

Jessia from Ontario asks

How high in the sky would Polaris the North Star be, as seen from the North Pole?

Ashé from Taree, Australia asks

Why is there no magnetic field in the centre of a bar magnet?

Richard Hart from Victoria, BC, Canada asks

My wife asked me, "What does the sun burn and why doesn't it burn out?" I told her about helium...

Wayne Boutzale asks

What are giant ice meteorites? Would it be possible for them to hit the earth?

Willam Lockie asks

What is the protocol used to determine where each country is allowed to put its satellites to avoid...

Edward from Mississauga, ON asks

I have a wierd thinking question regarding electricity. When we have a positive charge or a...

Neil O. from Oshawa asks

What can you tell me about the likelihood of a major solar storm in or around 2012, and how it...

John Crowe from Dublin asks

If I knew the centre of the universe and began to travel toward it, would I begin to decrease in...

Darren Connell from the Internet asks

We have the ability to use sound frequency to cancel out unwanted sounds, and since light is a...

Jestin from India asks

Why rainbow is a bow?

Shaun Carney from the Internet asks

What keeps electrons from eventually falling into the nucleus of an atom if they are attracted by...

Daniel from Singapore asks

Is there such thing as an Ice Bullet? A bullet that melts into the target so that there will be...

kumar sah from Davis Ca. asks

I want to explain to my 6 year old daughter, why the rainbow appears bent/arched in a semicircle in...