Types of electromagnetic radiation used to provide info

Question 1

What can EM radiation do?

Answer 1

• EM radiation can travel through outer space as waves at the speed of light

Question 2

X-rays and gamma rays-

Answer 2

info about violent events occurring near black holes, where matter is being torn apart

Question 3

Microwave telescope

Answer 3

beginnings of the universe

Question 4

Ultraviolet telescope

Answer 4

spotting star explosions

Question 5

Light telescopes

Answer 5

Began to take photographs through telescopes and analyze starlight by studying the spectrum of different light frequencies coming from stars. Allowed much more to be learnt.
• Became possible to measure distance to stars, temperature and their chemical make-up.

Question 6

Modern Astronomers:

Answer 6

light collected by electronic detectors called CCD’s and processed by computers.

Question 7

Measuring distance:

Answer 7

– when same star photographed at time 6 months apart, some stars change position slightly. Careful measurements of photo allow calculation of how far way the star is.

Question 8

Measuring temperature:

Answer 8

Astronomers pass light from individual stars though prism, then photograph colour spectrum of light.
• Different stars emit different mixture of colours of light, eg red or blue
• Can tell surface temperature of each star.

Question 9

Spectral lines:

Answer 9

reveals which chemical elements are present in the star, from the fine black lines or bright lines at particular frequencies.
• Each type of atom absorbed or emits light at precise frequencies to make its own unique spectral pattern.

Question 10

Radio Astronomy:

Answer 10

study radio signals from space, give info not available from visible light. Can penetrate though clouds of gas and dust in a dark nebula, analyzing radio signals and get a ‘picture; of what is going on inside cloud.

Question 11

Hubble Space Telescope

Answer 11

• One of the most important outward-looking satellites orbiting the Earth

Question 12

What is the Hubble telescope?

Answer 12

• The Hubble is a light telescope that collects electromagnetic radiation from the visible spectrum

Question 13

Hubble telescope interesting facts?

Answer 13

-Hubble has been transmitting amazing images back to astronomers since April 1990. - only satellite that can be upgraded in space. allows it to be refitted with the latest technologies and to repair equipment that malfunctions technologies and to repair equipment that malfunctions.