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M8, the Lagoon Nebula. It is located 5,200 light-years away in the constellation Sagittarius.

 

heic1517a_1.jpg

 

Photo: NASA/ESA (Hubble)

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M16, The Eagle Nebula and the Pillars of Creation. Spanning ~4 to 5 light-years, the Pillars are a small part of the Eagle Nebula, which covers 70 by 55 light-years. It is located 7000 light-years from Earth in the constellation Serpens.

 

hubble_birthofstars_0.jpg

 

Photo: NASA/ESA (Hubble)

 

This spire stretches 9.5 light years, or more than twice the distance from the Sun to our nearest star.

 

heic0506b.jpg

 

Photo: NASA/ESA (Hubble)

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M42 - The Orion Nebula.

 

orion-nebula-xlarge_web.jpg

 

Photo: NASA/ESA (Hubble)

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M51 - The Whirlpool Galaxy is located 31 million light-years from Earth in the constellation Canes Venatici.

 

m51-and-companion_0.jpg

 

Photo: NASA/ESA (Hubble)

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M57 - The Ring Nebula. Located 2000 light-years away in the constellation Lyra. The tiny white dot in the center is the white dwarf remnant of the previous red giant star. The shell of expelled ionized gas of the planetary nebula contains helium (deep blue color), hydrogen and oxygen (light blue color), and nitrogen and sulfur (red color).

 

 

ring-nebula-full_jpg.jpg

 

Photo: NASA/ESA (Hubble)

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1E 0102.2-7219, the remnants of a supernova in the Small Magellanic Cloud dwarf galaxy, a close neighbor of the Milky Way (200,000 light-years). Hidden within the 2000 year old supernova explosion is a neutron star.

 

ESO-Discovers-a-Dead-Star-Circled-by-Light-777x776.jpg

 

Hubble-Views-the-Surroundings-of-a-Hidden-Neutron-Star.jpg

 

Image: ESO/NASA, ESA and the Hubble Heritage Team (STScI/AURA)/F. Vogt et al.

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So here is a conundrum about star death and re-berth I could never wrap my head around. A star collapses and blows up to produce a supernova. That produces a nebula, which condenses and produces new stars and solar systems.

 

Wait, conservation of mass?

 

What's the conundrum? Massive stars (8+ solar masses) explode at the end of their lives when their cores produce iron (Type Ib, Ic, and II), which is unable to fuse into heavier elements. The stars undergoes sudden gravitational collapse (with speeds up to 70,000 kph/43,495 mph or 23% the speed of light), with the core compressing to a critical density (i.e. neutron star). The process releases enough energy to blast the remaining outer layers of lighter elements into interstellar space. The resultant shock wave can trigger the formation of new stars. In fact, depending on the initial mass of the star, a good chuck of the stars mass has already been ejected before the remaining star explodes.

 

I believe that roughly half of the mass is converted into energy, with 99% of it carried away in a 10 second burst of neutrinos (1058). An early warning system called SNEWS consists of a network of neutrino detectors that is programmed to send an alert if two detectors see a burst within 10 seconds of each other. This allows astronomers to train their instruments on that patch of the sky.

 

That leaves plenty of mass thrown out to begin the next generation of stars. I believe subsequent generations are smaller.

 

It's estimated that supernova occur at a rate of 10 per second in the universe.

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So here is a conundrum about star death and re-berth I could never wrap my head around. A star collapses and blows up to produce a supernova. That produces a nebula, which condenses and produces new stars and solar systems.

 

Wait, conservation of mass?

 

What's the conundrum? Massive stars (8+ solar masses) explode at the end of their lives when their cores produce iron (Type Ib, Ic, and II), which is unable to fuse into heavier elements. The stars undergoes sudden gravitational collapse (with speeds up to 70,000 kph/43,495 mph or 23% the speed of light), with the core compressing to a critical density (i.e. neutron star). The process releases enough energy to blast the remaining outer layers of lighter elements into interstellar space. The resultant shock wave can trigger the formation of new stars. In fact, depending on the initial mass of the star, a good chuck of the stars mass has already been ejected before the remaining star explodes.

 

I believe that roughly half of the mass is converted into energy, with 99% of it carried away in a 10 second burst of neutrinos (1058). An early warning system called SNEWS consists of a network of neutrino detectors that is programmed to send an alert if two detectors see a burst within 10 seconds of each other. This allows astronomers to train their instruments on that patch of the sky.

 

That leaves plenty of mass thrown out to begin the next generation of stars. I believe subsequent generations are smaller.

 

It's estimated that supernova occur at a rate of 10 per second in the universe.

 

I think I understand now. So it has to be a massive star that explodes to eject enough stuff to create new stars. Still, I have to digest all of this information. Thanks Arg. Are you a physicist?

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Yeah, the earliest stars were enormous beasts. The bigger the star, the hotter it is, the faster it burns through its fuel, and the quicker it dies. All the elements heavier than iron are made in the supernova of these dying stars, which ultimately produced the materials necessary for rocky planets, and life. Our sun is believed to be a second or third generation star, containing hydrogen and helium created during the Big Bang, along with heavier elements created when the first generation stars exploded.

 

No, not a physicist, but I've taken numerous courses. At one point I was dreaming of becoming an astronomer, but sitting on a mountaintop all night had its downsides. Lol. I currently live on a steady diet of space-related documentaries, e.g. How the Universe Works. They peak my curiosity enough to do some additional research on the topics. I have way more questions than answers on topics such as dark matter, black holes, interstellar space, star formation, etc. The universe is truly wonderful.

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Yeah, the earliest stars were enormous beasts. The bigger the star, the hotter it is, the faster it burns through its fuel, and the quicker it dies. All the elements heavier than iron are made in the supernova of these dying stars, which ultimately produced the materials necessary for rocky planets, and life. Our sun is believed to be a second or third generation star, containing hydrogen and helium created during the Big Bang, along with heavier elements created when the first generation stars exploded.

 

No, not a physicist, but I've taken numerous courses. At one point I was dreaming of becoming an astronomer, but sitting on a mountaintop all night had its downsides. Lol. I currently live on a steady diet of space-related documentaries, e.g. How the Universe Works. They peak my curiosity enough to do some additional research on the topics. I have way more questions than answers on topics such as dark matter, black holes, interstellar space, star formation, etc. The universe is truly wonderful.

 

You just touched on another question I had bouncing around in my head, about our sun being a 2nd or 3rd generation star. I always wondered where the heavy elements came from when our sun was formed from clouds of H. But then, if there was all this heavy stuff floating around, why didn't our sun just form a super huge planet with a rocky core?

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You just touched on another question I had bouncing around in my head, about our sun being a 2nd or 3rd generation star. I always wondered where the heavy elements came from when our sun was formed from clouds of H. But then, if there was all this heavy stuff floating around, why didn't our sun just form a super huge planet with a rocky core?

 

The sun does contain heavy elements, but they represent only a tiny fraction of the overall mass of the sun. It's 70% hydrogen and 28% helium. Carbon, nitrogen, and oxygen make up 1.5%, and the other 0.5% are small amounts of the heavier elements, e.g. iron, silicon, magnesium.

 

While a supernova does create the heavier elements, they remain a small fraction of the amount of hydrogen and helium in the universe. Keep in mind that the sun is 333,000 times the mass of the Earth. 1.3 million Earths could fit inside the sun. If the sun swallowed our planet, it would add 0.0003% more heavy elements.

 

So basically, the sun has over 1000 Earth's worth of heavy elements in its core. I'm not exactly sure how a star initially forms, but I wouldn't be surprised if a large rocky clump sits in the middle of the protoplanetary disc, pulling in the hydrogen and helium until sufficient mass has built up to ignite the star.

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You just touched on another question I had bouncing around in my head, about our sun being a 2nd or 3rd generation star. I always wondered where the heavy elements came from when our sun was formed from clouds of H. But then, if there was all this heavy stuff floating around, why didn't our sun just form a super huge planet with a rocky core?

 

The sun does contain heavy elements, but they represent only a tiny fraction of the overall mass of the sun. It's 70% hydrogen and 28% helium. Carbon, nitrogen, and oxygen make up 1.5%, and the other 0.5% are small amounts of the heavier elements, e.g. iron, silicon, magnesium.

 

While a supernova does create the heavier elements, they remain a small fraction of the amount of hydrogen and helium in the universe. Keep in mind that the sun is 333,000 times the mass of the Earth. 1.3 million Earths could fit inside the sun. If the sun swallowed our planet, it would add 0.0003% more heavy elements.

 

So basically, the sun has over 1000 Earth's worth of heavy elements in its core. I'm not exactly sure how a star initially forms, but I wouldn't be surprised if a large rocky clump sits in the middle of the protoplanetary disc, pulling in the hydrogen and helium until sufficient mass has built up to ignite the star.

 

I guess my question is if our galaxy condensed from a huge nebula, why is the sun 70% H, while the inner planets are mostly Fe, Ni, and Si? There seems to have been a selective condensation happening. The inner 4 planets are rocky iron based, while the sun and the rest of them are gas based. It's almost like galactic chromatography but with separation based on gravity rather than BP?

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I guess my question is if our galaxy condensed from a huge nebula, why is the sun 70% H, while the inner planets are mostly Fe, Ni, and Si? There seems to have been a selective condensation happening. The inner 4 planets are rocky iron based, while the sun and the rest of them are gas based. It's almost like galactic chromatography but with separation based on gravity rather than BP?

 

When the sun ignited, the blast of solar wind blew away the lighter elements in the inner solar system, leaving primarily the heavy elements. That's why we have small, rocky planets near the sun.

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I guess my question is if our galaxy condensed from a huge nebula, why is the sun 70% H, while the inner planets are mostly Fe, Ni, and Si? There seems to have been a selective condensation happening. The inner 4 planets are rocky iron based, while the sun and the rest of them are gas based. It's almost like galactic chromatography but with separation based on gravity rather than BP?

 

When the sun ignited, the blast of solar wind blew away the lighter elements in the inner solar system, leaving primarily the heavy elements. That's why we have small, rocky planets near the sun.

 

I remember hearing that on a number of documentaries, just forgot.Then a perturbation in the orbits of Jupiter and Saturn brought water bearing comets raining in upon the newborn earth from the oort cloud. It's awesome how the formation of our little goldilocks section of the galaxy was so fortuitous. Although it is calculated that there are billions x billions possible planets in similar proximate orbits as our earth across the universe, how many could have undergone such fortuitous events as ours? I guess the answer is still billions...

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There is also a theory that either Neptune, or the yet-to-be-found Planet 9 tugged Jupiter to its current location, as it was much closer to the Sun, In the process it cleared out our little corner of the solar system. Otherwise we would have very likely crashed into Jupiter eons ago.

 

In the Universe, the saying goes, "If you're one in a billion, there are a billion of them just like you".

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M61, a barred spiral galaxy in the constellation Virgo located 55 million light-years away. The galaxy has been the host of 7 observed supernovas.

 

potw1417a.jpg

 

Photo: ESA/Hubble & NASA

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Happy 28th anniversary, Hubble. The Lagoon Nebula, 4000 light years away, 55 light years wide, and 20 light-years tall. This image shows a 4 light-year wide section.

 

lagoonnebulahubble.jpg

 

A section in infrared.

 

heic1517a.jpg

 

Photo: NASA/ESA/STScl

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The ESA's Gaia spacecraft team has released the most detailed map of the Milky Way ever created. The map contains ~1.7 billion stars. Every pinpoint of light on the image is a star or distant galaxy. What's more amazing is that the data represents less than 1% of the total stars in our galaxy (250 billion +/- 150 billion).

 

x2ii1bmckrfigqngq8ll.png

 

Larger (4000x2000) image: https://www.cosmos.e...r_4000x2000.png

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The ESA's Gaia spacecraft team has released the most detailed map of the Milky Way ever created. The map contains ~1.7 billion stars. Every pinpoint of light on the image is a star or distant galaxy. What's more amazing is that the data represents less than 1% of the total stars in our galaxy (250 billion +/- 150 billion).

 

x2ii1bmckrfigqngq8ll.png

 

Larger (4000x2000) image: https://www.cosmos.e...r_4000x2000.png

 

Arg, what are those blobs bottom right?

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Those are the Large and Small Magellanic Clouds. They are dwarf galaxies that orbit just outside the Milky Way ~160,000 to 200,000 light years away. By comparison the Andromeda galaxy is 2.5 million light-years away. The two galaxies orbit the Milky Way once every 1.5 billion years. The LMC contains ~30 billion stars, and the SMC contains ~3 billion stars. The LMC is 14,000 light-years across, and the SMC is 7000 light-years across.

 

dr2-dggc-fullsky_annotated_orbits_cb2_high.png

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Those are the Large and Small Magellanic Clouds. They are dwarf galaxies that orbit just outside the Milky Way ~160,000 to 200,000 light years away. By comparison the Andromeda galaxy is 2.5 million light-years away. The two galaxies orbit the Milky Way once every 1.5 billion years. The LMC contains ~30 billion stars, and the SMC contains ~3 billion stars. The LMC is 14,000 light-years across, and the SMC is 7000 light-years across.

 

dr2-dggc-fullsky_annotated_orbits_cb2_high.png

 

Those lines are their respective paths? Cool. But, if those magellanic clouds are orbiting the milky way, that means they are engaged in our gravity (and us in theirs)? That is mind blowing. Space is indeed awesome.

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Yes, the LMC and SMC are gravitationally bound to our galaxy, and are know as satellite galaxies. There are roughly 15 other dwarf satellite galaxies. The Milky Way will eventually swallow them up before long, just as it has with many other dwarf galaxies that used to orbit nearby.

 

Over the next few billion years all galaxies in the Local Group will merge into one large galaxy, likely an elliptical galaxy.

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  • 2 weeks later...

A edge on view of Saturn and its rings taken by Cassini on 3 March 2006. The moons Mimas and (tiny) Janus are above, and Tethys is below. As the Maitre D said in Monty Python's Meaning of Life, "It's only wafer thin."

 

pia18323-1041.jpg

 

Credit: NASA/JPL-Caltech/Space Science Institute

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Ping i200 6-P Orange Dot (2 Deg Weak, 2 Deg Flat) - True Temper XP 95 S
Ping Glide 4.0 52-12 S, 56-10 Eye2, and 60-10 S Orange Dot (2 Deg Flat) - Ping Z-Z115 Wedge
PXG Blackjack 36" - SuperStroker Flatso 2.0

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  • 2 weeks later...

First image from the Transiting Exoplanet Survey Satellite (TESS), as it heads out towards its final elliptical orbit around the earth. Once in position TESS will survey ~200,000 stars within 300 light-years from Earth. This image captures only 0.25% of the amount of sky that TESS will image.

 

n2ipi9eoidl2oprulbsm.jpg

 

Image: NASA/MIT/TESS

Ping G425 Max Driver 12 (0 Flat) - Aldila Ascent Red 50 Stiff (46")
TaylorMade AeroBurner Mini Driver 16 - Matrix Speed RUL-Z 60 Stiff
Ping G410 7wd 20.5 (0 Flat) - Alta CB 65 Stiff (43")
Ping G410 9wd 23.5 (0 Flat) - Alta CB 65 Stiff (42.5")
Ping G425 6h 30 (0 Flat) - Alta CB 70 Stiff
PXG 0311P Gen3 6-P (2 Deg Weak, 1 Deg Flat) - True Temper Elevate 95 S /

Ping i200 6-P Orange Dot (2 Deg Weak, 2 Deg Flat) - True Temper XP 95 S
Ping Glide 4.0 52-12 S, 56-10 Eye2, and 60-10 S Orange Dot (2 Deg Flat) - Ping Z-Z115 Wedge
PXG Blackjack 36" - SuperStroker Flatso 2.0

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  • 2 weeks later...

The Tarantula Nebula in the neighboring Large Magellanic Cloud. The nebula is ~1000 light-years across.

 

zanqhxtfon1xdkux578h.jpg

 

Image: ESO

Ping G425 Max Driver 12 (0 Flat) - Aldila Ascent Red 50 Stiff (46")
TaylorMade AeroBurner Mini Driver 16 - Matrix Speed RUL-Z 60 Stiff
Ping G410 7wd 20.5 (0 Flat) - Alta CB 65 Stiff (43")
Ping G410 9wd 23.5 (0 Flat) - Alta CB 65 Stiff (42.5")
Ping G425 6h 30 (0 Flat) - Alta CB 70 Stiff
PXG 0311P Gen3 6-P (2 Deg Weak, 1 Deg Flat) - True Temper Elevate 95 S /

Ping i200 6-P Orange Dot (2 Deg Weak, 2 Deg Flat) - True Temper XP 95 S
Ping Glide 4.0 52-12 S, 56-10 Eye2, and 60-10 S Orange Dot (2 Deg Flat) - Ping Z-Z115 Wedge
PXG Blackjack 36" - SuperStroker Flatso 2.0

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  • 3 weeks later...

A view of the lost Philae lander on comet 67P/Churyumov-Gerasimenko taken by the Rosetta probe.

 

h1bfinjhz6mrihc7gvub.jpg

 

Image: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

 

g8apqhahsyrks60xswb6.jpg

 

Image: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

 

An image taken from 8 miles (13 km).

 

a2h0wqls5uj1kwehnbsq.png

 

Image: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

Ping G425 Max Driver 12 (0 Flat) - Aldila Ascent Red 50 Stiff (46")
TaylorMade AeroBurner Mini Driver 16 - Matrix Speed RUL-Z 60 Stiff
Ping G410 7wd 20.5 (0 Flat) - Alta CB 65 Stiff (43")
Ping G410 9wd 23.5 (0 Flat) - Alta CB 65 Stiff (42.5")
Ping G425 6h 30 (0 Flat) - Alta CB 70 Stiff
PXG 0311P Gen3 6-P (2 Deg Weak, 1 Deg Flat) - True Temper Elevate 95 S /

Ping i200 6-P Orange Dot (2 Deg Weak, 2 Deg Flat) - True Temper XP 95 S
Ping Glide 4.0 52-12 S, 56-10 Eye2, and 60-10 S Orange Dot (2 Deg Flat) - Ping Z-Z115 Wedge
PXG Blackjack 36" - SuperStroker Flatso 2.0

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