Author Question: Describe how the radio lobes get to the outside of their galaxy. Where do they come from? How is it ... (Read 33 times)

nenivikky · **on:** Jul 27, 2018

Describe how the radio lobes get to the outside of their galaxy. Where do they come from? How is it that they still exist this far away from their origin? Estimate how much time it might take these lobes to travel to their current locations.

What will be an ideal response?

Question 2

The average rate of erosion on the Moon is far less than on Earth because:

A) the crust of the Moon is much denser than the Earth's crust.
B) the Moon is much younger than the Earth.
C) the Moon lacks wind, water and an atmosphere.
D) the Moon's magnetic field protects it from the solar wind better than ours does.
E) the Moon's mare long ago dried up, so there is no more wave erosion there.

Liamb2179 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

Active galaxies sometimes eject jets of charged elementary particles deep into space at nearly the speed of light. The jets are so energetic that they punch through any intervening matter. The jets also contain intense magnetic fields, and as the charged particles interact with the magnetic fields they emit synchrotron radiation, which is at radio wavelengths. Jets travel at nearly light speed, so if a lobe is 300,000 light years (about 100 kpc) from the galactic core, it took 300,000 years to get there.

Answer to Question 2

C