Learn the expressions from this gallery and then take the !
Photo: Science Photo Library
Seeing stars
We use this expression when you feel dizzy after suffering an accident where you've been hit on the head.
I was seeing stars for days after falling off my bike and landing on my head.
Japanese astronaut Soichi Noguchi waves at a crewmate outside the Discovery space shuttle in 2005. Photo: Steve Robinson/NASA/ via Getty Images
Out of this world
Something that is out of this world is extraordinary, in a positive sense.
Have you been to Disneyland? It's out of this world!
North America taken by the Geostationary Satellite system (GOES), used for weather forecasting. Photo: Earth Satellite Corporation/Science Photo Library
To promise the earth
If someone promises the earth, it means that they say they will do things beyond their ability to deliver.
My boyfriend promises the earth with birthday presents but always forgets in the end.
Photo: ÃÛÑ¿´«Ã½
To be worlds apart
We use this expression to talk about two things which are completely different.
Mike and Ken are twins but their personalities are worlds apart.
The Rocket Garden at the John F. Kennedy Space Centre, Florida. Photo: ÃÛÑ¿´«Ã½
It's not rocket science
This is used to talk about things that should not be very difficult to do.
Why has it taken you an hour to change that light bulb? It's not rocket science.
An image from the surface of Mars. Photo: NASA
To be on another planet
You say this about someone who doesn't seem to notice what is happening around them.
I asked Kate what the time was four times before she answered. She's on another planet, that woman.
