Hey, Mom! The Explanation.

Here's the permanent dedicated link to my first Hey, Mom! post and the explanation of the feature it contains.

Also,

Friday, November 7, 2025

A Sense of Doubt blog post #3916 - SPACE: Spiral Galaxy in Lion's Heart - from HUBBLE

A Sense of Doubt blog post #3916 - SPACE: Spiral Galaxy in Lion's Heart - from HUBBLE

Just a share today. This one caught my attention.

Thanks for tuning in.


https://www.space.com/astronomy/galaxies/hubble-sees-spiral-galaxy-in-lions-heart-space-photo-of-the-day-for-oct-30-2025


Hubble sees spiral galaxy in Lion's heart | Space photo of the day for Nov. 4, 2025

Located in the constellation Leo, spiral galaxy NGC 3370 has long been a favorite among astronomers. NGC 3370 is part of a small galaxy group that also other galaxies studied by the Hubble Space Telescope. Studying these galaxies together helps astronomers understand how galaxies interact, evolve and influence one another over cosmic timescales.

What is it?

The Milky Way, our own galactic home, is one such spiral, and studying other examples like NGC 3370 provides astronomers with clues about how galaxies form and evolve.

Where is it?

Spiral galaxy NGC 3370 is located 90 million light years away in the Leo constellation.



Why is it amazing?

NGC 3370 is home to two types of celestial landmarks that have helped astronomers chart cosmic distances with precision: Cepheid variable stars and Type la supernovas. Cepheids are pulsating stars whose brightness rises and falls in predictable cycles, the longer the period of pulsation, the more luminous they are. Meanwhile, Type la supernovas occur when a white dwarf star undergoes a thermonuclear explosion, reaching nearly the same peak brightness each time.

By comparing how bright these objects appear from Earth with how bright they actually are, astronomers can calculate their distances, and in turn, measure how quickly the universe is expanding. Together, these "standard candles" form the backbone of the cosmic distance ladder, a framework that has shaped our modern understanding of cosmic scale and motion.

Want to learn more?

You can learn more about the Hubble Space Telescope and galaxy formation.


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- Bloggery committed by chris tower - 2511.07 - 10:10

- Days ago: MOM = 3781 days ago & DAD = 435 days ago

- New note - On 1807.06, I ceased daily transmission of my Hey Mom feature after three years of daily conversations. I post Hey Mom blog entries on special occasions. I post the days since ("Days Ago") count on my blog each day, and now I have a second count for Days since my Dad died on August 28, 2024. I am now in the same time zone as Google! So, when I post at 10:10 a.m. PDT to coincide with the time of Mom's death, I am now actually posting late, so it's really 1:10 p.m. EDT. But I will continue to use the time stamp of 10:10 a.m. to remember the time of her death and sometimes 13:40 EDT for the time of Dad's death. The blog entry numbering in the title has changed to reflect total Sense of Doubt posts since I began the blog on 0705.04, which include Hey Mom posts, Daily Bowie posts, and Sense of Doubt posts. Hey Mom posts will still be numbered sequentially. New Hey Mom posts will use the same format as all the other Hey Mom posts; all other posts will feature this format seen here.

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