A form of an element with a different number of neutronsA form of an element with a different number of protonsA form of an element with a different number of electronsA form of an element that is unstable radioactively
There can be stable and unstable neutrons — the main thing is they have a different number of neutrons (and therefore a different mass) but the same number of protons as the normal form of an element.
Titan is a moon of Saturn!
Learn more about dwarf planets here!
Inner coreOuter coreUpper mantleLower mantle
It's the lower mantle!
The lower mantle. So hot right now.
The Triangulum GalaxyThe Andromeda GalaxyThe Pinwheel GalaxyThe Tadpole Galaxy
Sure, there are closer satellite and dwarf galaxies, but when it comes to major systems, Andromeda is closest.
Heavy rains in temperate regionsIncreased monsoons in Southeast AsiaWarm ocean temperatures in the Equatorial PacificExcessive drought in sub-tropical regions
The event is defined by the ocean temperatures in one region, but its effects are global.
The Moon does not rotate.The Sun's gravity locks the moon in place.The Moon rotates in the opposite direction of Earth.The moon completes a rotation in the same amount of time it completes one orbit around the Earth.
Earth's rotation and the Moon's are synchronous.
Bronze is an alloy!
That means it's a mix of copper, tin, and some other metals.
The closest planet to the Sun!
It legit makes life happen on this planet.
CurrentSpeed of lightBinding energyConductivity
Mass–energy equivalence, bro!
The equation says that the energy of something is equal to the mass of something times the speed of light squared. It's a pretty big deal.
Mariner 10New HorizonsVoyager 2Voyager 1
Voyager 1, baby!
By some measures, it has left the solar system!
That's a trilobite!
More specifically, this one belongs to the genus Cheirurus.
4.02 billion years old4.25 billion years old4.54 billion years old4.72 billion years old
That's around 4,540,000,000 years old!
The number comes from radiometric dating of old solar system bits.
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