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Not a constant: the Hubble “constant” changes over time
Not a constant: the Hubble “constant” changes over time
The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?
Ethan Siegel
Apr 24
Does light itself truly have an infinite lifetime?
Does light itself truly have an infinite lifetime?
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
Ethan Siegel
Apr 23
No, the expanding Universe doesn’t break the speed of light
No, the expanding Universe doesn’t break the speed of light
Yes, the Universe is expanding, but if you’ve ever wondered, “How fast is it expanding,” the answer isn’t in terms of a speed at all.
Ethan Siegel
Apr 22
The consequences of traveling in a straight line forever
The consequences of traveling in a straight line forever
Is the Universe finite or infinite? Does it go on forever or loop back on itself? Here’s what would happen if you traveled forever.
Ethan Siegel
Apr 19
The physical reason behind quantum uncertainty
The physical reason behind quantum uncertainty
No matter how good our measurement devices get, certain quantum properties always possess an inherent uncertainty. Can we figure out why?
Ethan Siegel
Apr 18
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