Gravitational Lensing
Gravitational lensing is the bending of light from distant objects by the gravity of massive bodies that lie in between, which can magnify and…
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The Bending of Starlight
The bending of starlight is the deflection of light by gravity, predicted by Einstein's general theory of relativity and confirmed during a solar…
The Cosmic Microwave Background
The cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from the early universe. Its…
Gravitational Waves
Gravitational waves are ripples in the fabric of space and time, set off by some of the most violent events in the universe. Predicted by Einstein a…
The Expansion of the Universe
The universe is expanding: the galaxies are, on average, moving apart, and the space between them is stretching. Once a startling discovery, the…
The Age of the Universe
The universe is about 13.8 billion years old. Once a matter of wide uncertainty and heated debate, this figure is now known with remarkable…