Lunar eclipse aligns with blue moon and supermoon tonight.

A total lunar eclipse will occur tonight into Wednesday morning and coincides with a blue moon and, for some observers, a supermoon, a NASA planetary geologist said; much of the United States could see the event.

Much of the United States could see a total lunar eclipse tonight and into Wednesday morning. The event brings together multiple lunar phenomena that happen at the same time. A lunar eclipse occurs when the Earth passes between the sun and the moon and blocks sunlight from reaching the moon. It also coincides with a blue moon, the second full moon in a calendar month, and is considered by some observers a supermoon because the full moon is closer to Earth. Key details: - A total lunar eclipse will occur tonight into Wednesday morning. - A lunar eclipse happens when Earth passes between the sun and the moon and blocks sunlight from reaching the moon. - The event coincides with a blue moon, defined as the second full moon in a calendar month. - Some observers describe this as a supermoon when the full moon is closer to Earth and may appear slightly larger or brighter. - NASA planetary geologist Dr. Noah Petro described the timing as a collision of multiple lunar events, and some observers have used the term super blue blood moon eclipse. - Much of the United States could witness the event, according to the article. Summary: The eclipse will be visible across much of the United States tonight into Wednesday morning and combines a total lunar eclipse, a blue moon, and, for some observers, a supermoon. Timing and local visibility will vary by location.