This is so making me not want to go to work...
Cratering gives us much information. Surfaces with more cratering are older than surfaces with less cratering for example. Cratering also gives us an idea of how geologically active a world is. Less craters, more likely to have been or be geologically active.
The earliest in history we can look back (with electromagnetic radiation that is) is about 380000 years after the Big Bang because the universe was too hot before this for light to get around. This Planck image shows what the surface of this was - seen as the CMB.
All set for Remembrance Day ceremonies.
Sunspots can be quite large. These ones from 07 July 2014 are larger than the Earth (dot indicated is the size of Earth to scale).
Stars also have similar spots and their appearance on the star makes it harder to locate exoplanets.
One way that planetary nebula are discovered is by taking images through broad band filters then comparing them to narrow band line filters. The PN will dim less than the stars. This can be seen by comparing the RGB image of NGC6058 (left) to the narrow H Alpha (right). #astrophoto
M20 - The Trifid Nebula - is an HII star formation region in Sagittarius. It is about 5500 ly away from Earth. Observations a various wavelengths (IR, visual, X-Ray) have identified stars at many stages of formation inside the nebula.
My child learning to polish his boots.
Carbon dioxide levels as measured in Calgary. Day of the week, hour of the weekdays, and hour of the weekend averages. Some interesting patterns.
My child is off on his first Navy League Cadet campout for the weekend. Let the peace and quiet commence...
Daylight savings - all cost, no benefit
There’s an evil amount of carbon dioxide outside...