| 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 |
|
