Quote:
Originally Posted by malclocke
An ATEL was posted yesterday at http://www.astronomerstelegram.org/?read=5639 Pontificia Universidad Catolica de Chile Observatory. They have among other things made a measurement of the interstellar extinction, i.e. how much the light has been affected by interstellar dust, which gives a crude distance measurement. |
Thanks.
It's amazing that they can be so sure about these distances.
How do they know that it's not coming from a supernova in a distant galaxy?
They obviously think that it's not far away in our own galaxy.