| You can’t directly see a black hole because light cannot escape them | Black Holes |
| Black holes are not holes. They are actually extremely dense objects | |
| Black holes may be portals to other parts of the universe | |
| Almost all black holes began their lives as stars | |
| Black holes have 4 types: primordeal, stellar, intermediate and supermassive | |
| The Milky Way is a disk of stars 120,000 light years across and 1,000 thick | Milky Way |
| The ancient Greeks believed it was milk spilt by the godess Hera | |
| There are between 100 billion and 700 billion stars in the Milky Way | |
| Because we are inside the Milky Way we can't truly see what it looks like | |
| We orbit the centre of the Milky Way at a speed of 828,000 km/h | |
| Einstein dismissed the theory at first, preferring to belirve the univere was static | Big Bang |
| Edwin Hubble proved the universe is expanding, lending weight to the theory | |
| The Big Bang created everything. Even space and possibly time | |
| All matter in the universe was originally contained in a single point | |
| The static on your TV or radio is radiation emitted by the Big Bang | |
| Invisible dark matter makes up 85% of the universe and 25% of its weight | Oddities |
| Though it looks round, the Moon is actually shaped like a lemon | |
| The Milky Way's centre tastes of raspberries and smells of rum | |
| The Sun loses 4 million tonnes of mass each second through nuclear fusion | |
| The full name for a quasar is a quasi-stellar radio source | |
| There are 88 constellations in total | Constellations |
| They were first named around 4,000 BCE. They were used to predict seasons | |
| All the constellations get their names from Greek mythology | |
| Hydra is the largest constellation by area. It takes up 3.16% of the sky | |
| The smallest constellation is Crux. It only takes up 0.17% of the sky | |
| The first supernova to be recorded happened in 185 CE | Supernavae |
| A supernova can give off more light than an entire galaxy | |
| A supernova occurs about once every 50 years in the Milky Way | |
| A nearby supernova (within 30 light years) could destroy all life on Earth | |
| 93% of the mass in our bodies comes from supernovae | |
| When you look at a star you are looking into the past | Stars |
| The bigger a star is, the shorter its life will be | |
| Most stars are red dwarfs | |
| 80% of stars are binary. That means they orbit around a twin star | |
| There could be 200,000,000,000,000,000,000,000 stars in the universe | |
| Exoplanets are worlds orbiting stars other than the Sun | Exoplanets |
| 22% of Sun-like stars have Earth-sized planets in their habitable zones | |
| So far we have discovered over 4,000 exoplanets | |
| Planets where liquid water exists are called "Goldilocks" planets | |
| Exoplanets are named after their stars along with a number | |
| 1 light year is about 9.5 trillion kilometres | Distances |
| The nearest star to Earth is Alpha Centauri 4.37 light-years away | |
| Andromeda, the nearest large galaxy, is 2.9 million light years away | |
| The furthest galaxies we know about are 13 billion light years away | |
| The observable universe (all we can see) is 93 billion light years across | |
| There are 2 trillion galaxies in the universe | Galaxies |
| There are 4 types of galaxy: spiral, irregular, SO and elliptical | |
| The Andromeda Galaxy is heading our way at a speed of 140 km/second | |
| There is a galaxy called "The Whirlpool". It was discovered in 1773 | |
| There are 2 small galaxies nearby. They are called the Magellanic Clouds | |
