01-07-2014 07:00

Scientists notice a signal. The signal is in space. It is 240 million light years away from the Earth.

The signal is special. Scientists don’t know its origin. However, scientists are happy about the signal. It proves that dark matter exists. Eighty-five per cent of space can be from dark matter. Dark matter does not send out light. It also does not take in light.

The signal is very interesting. Scientists want more information.

Difficult words: Earth (our planet), origin (place of start), prove (to show that something is true).

You can read the original story and watch the video in the Level 3 section.