Why are galaxies different shapes? - Live Science
Oct 17, 2020 1 min, 21 secs

At the very basic level there are two classifications for galaxy shapes: disk and elliptical.

A disk galaxy, also called a spiral galaxy, is shaped like a fried egg, said Cameron Hummels, theoretical astrophysicist at Caltech.

These galaxies have a more spherical center, like the yolk, surrounded by a disk of gas and stars — the egg white.

Edwin Hubble, who confirmed the existence of galaxies beyond our own only a century ago, called disk galaxies late-type galaxies because he suspected their shape meant they formed later in the history of the universe, according to NASA. .

Alternatively, elliptical galaxies — what Hubble called early-type galaxies — appear to be older.

Instead of rotating, like disk galaxies, stars in elliptical galaxies have more random movement, according to Robert Bassett, an observational astrophysicist who studies galaxy evolution at Swinburne University in Melbourne, Australia.

Elliptical galaxies are thought to be a product of a galaxy merger.

When two galaxies of equal mass merge, their stars start to tug on one another with gravity, disrupting the stars' rotation and creating a more random orbit, Bassett said. .

Hubble gave these galaxies their own classification — irregular galaxies.

Finally, a less common shape, lenticular galaxies seem to be a mix between an elliptical and a disk galaxy.

What scientists have uncovered so far about galaxies and their 3D shapes has been inferred using thousands of 2D images and by relying on other properties, such as galaxy color and motion, to fill in the blanks, Bassett said. .

Meanwhile, elliptical galaxies are filled with older stars — called red dwarfs — that aren't burning quite as hot or fast

1. Texas Teen Wins $25,000 for Developing Potential COVID-19 Treatment - TMZ
Oct 16, 2020 # health 23 secs
2. North Carolina reports first flu death of the season - WRAL.com
Oct 16, 2020 # health 51 secs
3. Lin-Manuel Miranda mourns 'In the Heights,' 'West Side Story' actress Doreen Montalvo - USA TODAY
Oct 18, 2020 # entertainment 1 min, 3 secs
4. Channing Dungey Is Next Chairman of Warner Bros. TV Group - NPR
Oct 19, 2020 # entertainment 19 secs
5. The West Wing reunion first-look photos with Martin Sheen, Bradley Whitford - Daily Mail
Oct 15, 2020 # entertainment 1 min, 22 secs
6. Metastatic breast cancer: Mom, 41, shares unusual symptom - TODAY
Oct 16, 2020 # health 1 min, 41 secs
7. Kamala Harris suspends travel after two people linked to Biden campaign test positive for coronavirus - CNBC
Oct 15, 2020 # politics 43 secs
8. COVID puts new twist on age-old American battle over voting rights | CBC News
Oct 17, 2020 # breaking 2 mins, 19 secs
9. This new technology may restore trust in photos and videos against the rise of deepfakes - Android Police
Oct 15, 2020 # technology 2 mins, 12 secs
10. Ben Wheatley’s demystified Rebecca is a pale imitation of the Hitchcock classic - The A.V. Club
Oct 15, 2020 # entertainment 1 min, 20 secs
11. Rule prevents Nick Saban from communicating if he is quarantined - 247Sports
Oct 15, 2020 # politics 54 secs
12. Star cluster discovery stumps astronomers - Inverse
Oct 15, 2020 # science 41 secs
13. John Cena Marries Girlfriend Shay Shariatzadeh in Secret Ceremony - E! NEWS
Oct 15, 2020 # entertainment 54 secs
14. Former Defense Secretary Of Mexico Arrested In Los Angeles - NPR
Oct 16, 2020 # politics 36 secs
15. Two planets, including 'Super Earth,' discovered 120 light-years away - Fox News
Oct 19, 2020 # science 42 secs
16. 'COVID fatigue' blamed for second surge in coronavirus cases; Chicago health experts warn people not to let their guard down - WLS-TV
Oct 21, 2020 # health 0 secs


Get monthly updates and free resources.


© Copyright 2020 365NEWSX - All RIGHTS RESERVED