Point a radio dish at the empty dark between the stars and a faint hiss comes back, from every direction at once. It is the cooled afterglow of the young universe, and the strongest clue we have that the Big Bang really happened.
The cosmic microwave background is faint microwave radiation reaching us from every direction, the cooled afterglow of the early universe and strong evidence for the Big Bang. The Hubble constant links a galaxy’s recession speed to its distance and can be used to estimate the age of the universe.
The cosmic microwave background (CMB) is microwave radiation coming from all directions in space, left over from the early universe. It is strong evidence for the Big Bang Theory.
The Hubble constant relates a galaxy’s speed to its distance, and its value can be used to estimate the age of the universe.
Detect the microwave background coming evenly from every direction in space.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
The cosmic microwave background is...
The cosmic microwave background is strong evidence for the...
The CMB is the leftover radiation from...
The Hubble constant relates a galaxy’s recession speed to its...
The CMB is the cooled glow of the early universe, and the Hubble constant ties speed to distance.
The cosmic microwave background comes from every direction in space, not from a single object. It is the cooled afterglow of the early universe and one of the strongest pieces of evidence for the Big Bang.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
A key feature of the cosmic microwave background is that it comes...
The cosmic microwave background supports the Big Bang because it is...
The Hubble constant can be used to estimate the...
The cosmic microwave background completes the Universe strand and Unit 6. Keep the chain going.