Maria (pl.), or mare (sing.)
"Seas", in Latin "Mare", plural "maria"
highlands
Dark regions on the surface of the moon are generally basalt flows. Basalt is a dark rock. The flows have been caused by rock melting due to heat generated by meteor impacts.
The moon surface features that probably formed when lava flows filled large basins are called maria, which are large, dark plains visible from Earth. These maria were created by ancient volcanic activity that filled the low-lying basin areas with basaltic lava flows.
Those are likely basaltic lava fields called "lava fields" or "lava beds." These areas are created when lava flows and cools to form a hardened surface. They can resemble oceans because of their dark color and often expansive appearance.
Dark spots on the sun that are visible with the naked eye at sunrise/sunset are sunspots, which are cold areas caused by the sun's magnetic field.
These dark flat areas are called lunar maria, which are large basaltic plains formed by ancient volcanic activity. They have lower elevation compared to the surrounding highlands and were formed billions of years ago by lava flows filling in large impact basins.
the light areas of the moon are called the highlands. the dark areas are called maria.
Dark spots that appear on the surface of the sun are called sunspots. They are areas of reduced temperature caused by interactions with the sun's magnetic field.
Basalt is an igneous rock with low silica content that flows easily due to its fluid nature when erupted. It is commonly found in volcanic areas and is dark in color.
The dark areas on the moon are known as maria, which are large, flat regions filled with solidified lava from ancient volcanic activity. These areas appear darker than the surrounding highlands due to their composition and lack of craters.
Dark areas on an x-ray are areas of less dense tissue or space. It is probably a hole that hasn't been filled in yet. The white parts of an x-ray are denser matter like bone.