Cheap Astronomy explores some old horizons and answers these questions. If the Big Bang happened 13.8 billion years ago how come we can still see it? How can we observe things that are receding from us at faster than the speed of light?
On the grand scale of things, galaxies are on the grand scale of things. How does the galaxy rotate? What is intergalactic dust made of? @cheapastro at #365DaysofAstro
E=mc squared is a nice straight-forward formula, indeed the energy-mass equivalence concept that underlies it is pretty straight-forward too. But why is that constant a velocity – and why is it squared?
Today @CheapAstro is about time and timing. What is time made of? Is Betelguese about to blow? Find the answers at #365DaysOfAstro
Today @CheapAstro takes some cheap shots at dubious cosmology claims. What exactly is vacuum energy? What do you make of Massive Gravity?
How long did the Universe take to complete the periodic table? Is Interstellar travel really out of the question? @CheapAstro will answer these questions today.
Are there really primordial black holes? What do you make of the helical drive? Today @CheapAstro investigates some unsubstantiated claims