A conjunction happens when 2 worlds meet
A conjunction is when two objects are close together on our sky's dome. Some conjunctions can't be seen, but others look spectacular.
Source: earthsky.org
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Guy Ottewell's Astronomical Calendar 2024 is here
The popular and information Astronomical Calendar for 2024 by Guy Ottewell is available. It comes in either electronic or printed form. Learn more here.
Source: earthsky.org
What are gravitational waves? Ripples in spacetime
First postulated by Albert Einstein in 1916 but not observed directly until September 2015, gravitational waves are ripples in spacetime.
Source: earthsky.org
See Messier 20, the Trifid Nebula | Astronomy Essentials
If you have an extremely dark sky, you can see the Trifid Nebula on as a fuzzy patch in the Milky Way. Binoculars show more and a telescope even more detail.
Source: earthsky.org
What is a globular cluster?
A globular cluster is a spherical collections of stars, orbiting in the halo of spiral galaxies. Our Milky Way galaxy has over 150 globular clusters.
Source: earthsky.org