4 results for “echo”

1. Matter, Energy & Physics

   Sound

   Echoes and sonar Sound bounces off hard surfaces, producing an echo. Large empty halls and caves

   Article · 3 min read

   

2. Animals

   Whales and Dolphins

   echoes, building a picture of their surroundings precise enough to tell a fish's species and to find

   Article · 4 min read

   

3. Animals

   Mammals

   echoes of their own ultrasonic shouts. Whales and dolphins returned to the sea 50 million years

   Article · 4 min read

   

4. Matter, Energy & Physics

   Gravity

   echo of two black holes, thirty times the mass of the Sun each, merging 1.3 billion

   Article · 4 min read