Quiz 14A

Even when you cannot see the flame directly, you can sense that a hot brick oven is hot inside. This is possible because

  1. you can see X-ray.
  2. you can feel the infrared radiation.
  3. you can smell the heat.
  4. you can sense the pressure.
  5. you can hear the crackle of fire.

Young stars form and inside a thick cocoon gas and dust. Astronomers tell that indeed there is a young star glowing inside such a cocoon (and not hiding just a hunk of cold bricks) using infrared light as shown here.