Size, distance, risk and what scientists will learn.
The 2004 scare, how the risk was removed, and what could still change its orbit.
Pick your city to see the local time of the Apophis closest approach on April 13, 2029, and whether the sky will be dark, in twilight or in daylight.
Where, when and with what equipment.
Gear, settings and focus tips for photographing the ISS and satellites, and how to practise for the Apophis flyby in 2029.
How the asteroid was found, nearly lost, scared the world and got its name.
Free sky maps and tools for beginners: Stellarium, NASA's Eyes on Asteroids, Spot the Station and Heavens-Above, and how to use them.
How the two compare in size and energy.
From asteroid surveys to NASA's DART mission.
A simple guide to space-rock terms.
What the term means, how NEOs are grouped and how many we have found.
How impact risk is calculated and what the Torino and Palermo ratings mean.
How the two risk scales differ, with worked examples from Apophis and 2024 YR4.
What simulations and NASA/NOAA workshops found about ocean impacts, wave size and distance, and when a splashdown is truly dangerous.
Two real asteroid airbursts, what they did and what they teach us.
How a spacecraft shortened the orbit of an asteroid moon by about 32 minutes.
How NASA collected about 121.6 grams of asteroid rubble and what it revealed.
How ESA will inspect the DART impact site and plans to meet Apophis in 2029.
Which asteroids could hold water and metals, what sample-return missions and Psyche have shown, and the legal and economic limits.
Why sunlight, the faintest of pushes, can change an asteroid's orbit over decades, and why it matters for predicting Apophis and other near-Earth objects.
If the universe is so large and old, why have we found no sign of other civilizations? A clear guide to the Fermi paradox and the main scientific ideas about it.
What the Drake equation is, what each term means, and why it is a tool for organizing ignorance, not a prediction.
What an Ohio radio telescope recorded in 1977, the main explanations, and what SETI has found since.
What the habitable zone means, how planets around other stars are found, and why a planet in the zone is not necessarily inhabited.
The iridium layer, shocked quartz, the buried 180 km crater and the 2016 drilling: how scientists know an asteroid struck Mexico, and what is still debated.
Real asteroid flybys that came closer to Earth than our satellites, how they were found, and what they say about Apophis in 2029.
How Edmond Halley predicted the return of a comet, what spacecraft found in 1986, and when you can next see it.
How scientists work out how big an asteroid is and how fast it is moving, from brightness and infrared light to radar and spacecraft.
What causes meteor showers, which 2027 showers the Moon will spoil, and simple tips for watching the Perseids, Geminids and more.
Where the rumor started and what the evidence says.
What official reports have found and the most common explanations.
Why a line of bright lights in the sky is usually a satellite train, how long it lasts, and how to tell it from a real unknown.