Quantum, Relativity & Forces Explained | Pixelated Physics
19 articles
Is Cosmological Redshift a Doppler Shift? Stret...
Light from distant galaxies arrives stretched to longer, redder wavelengths. Is that a Doppler shift from galaxies racing away, or space itself stretching the light? Here is the formula that...
Is Cosmological Redshift a Doppler Shift? Stret...
Light from distant galaxies arrives stretched to longer, redder wavelengths. Is that a Doppler shift from galaxies racing away, or space itself stretching the light? Here is the formula that...
Sidereus Nuncius: What Galileo Saw in 1610
In March 1610 Galileo published a short book of telescope observations: a mountainous Moon, a Milky Way made of stars and four moons circling Jupiter. Here is what he saw,...
Sidereus Nuncius: What Galileo Saw in 1610
In March 1610 Galileo published a short book of telescope observations: a mountainous Moon, a Milky Way made of stars and four moons circling Jupiter. Here is what he saw,...
Henrietta Leavitt's Law: How a Blinking Star Me...
In 1912 Henrietta Leavitt showed that brighter Cepheid stars pulse more slowly. That one relation became the first rung of the cosmic distance ladder, and it still sits at the...
Henrietta Leavitt's Law: How a Blinking Star Me...
In 1912 Henrietta Leavitt showed that brighter Cepheid stars pulse more slowly. That one relation became the first rung of the cosmic distance ladder, and it still sits at the...
How Do We Know Black Holes Exist if We Cannot S...
A black hole gives off no light of its own, so how can anyone claim to have found one? Through four independent lines of evidence: X-ray binaries like Cygnus X-1,...
How Do We Know Black Holes Exist if We Cannot S...
A black hole gives off no light of its own, so how can anyone claim to have found one? Through four independent lines of evidence: X-ray binaries like Cygnus X-1,...
How Big Is the Observable Universe if It Is 13....
Light has only had about 13.8 billion years to reach us, so why do cosmologists put the edge of the observable universe about 46 billion light-years away? The answer is...
How Big Is the Observable Universe if It Is 13....
Light has only had about 13.8 billion years to reach us, so why do cosmologists put the edge of the observable universe about 46 billion light-years away? The answer is...
How Do Stars Make Heavier Elements? The B²FH Pa...
The Big Bang left the universe almost entirely hydrogen and helium. Nearly everything else, the carbon in you and the iron in your blood, was forged in stars. In 1957...
How Do Stars Make Heavier Elements? The B²FH Pa...
The Big Bang left the universe almost entirely hydrogen and helium. Nearly everything else, the carbon in you and the iron in your blood, was forged in stars. In 1957...