Has the quantity of stellar mass of the Milky Way changed much since its formation? -Space

Has the quantity of stellar mass of the Milky Way changed much since its formation? -Space
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Answer :

In March 2019, astronomers reported that the mass of the Milky Way galaxy is 1.5 trillion solar masses within a radius of about 129,000 light-years, over twice as much as was determined in earlier studies, and suggesting that about 90% of the mass of the galaxy is dark matter.
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Related questions

Since the area of event horizon increases as matter falls into it, do stellar black holes ultimately become supermassive black holes as time progresses? -Space

Description : Since the area of event horizon increases as matter falls into it, do stellar black holes ultimately become supermassive black holes as time progresses? -Space

Last Answer : The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic ... matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.

What are the typical values of gas fraction (gas to stellar mass) in a spiral galaxy as a function of Hubble type? -Space

Description : What are the typical values of gas fraction (gas to stellar mass) in a spiral galaxy as a function of Hubble type? -Space

Last Answer : We show that the gas mass fraction of spiral galaxies is strongly correlated with luminosity and surface brightness. It is not correlated with linear size. Gas fraction varies with luminosity and ... the onset of significant star formation can be delayed for arbitrary periods in tenuous gas disks.

Would it be possible that at the formation of the Milky Way every star was born in a binary or multiple system? -Space

Description : Would it be possible that at the formation of the Milky Way every star was born in a binary or multiple system? -Space

Last Answer : Our Milky Way continues to form the equivalent of one Sun every year. But in the past, that rate was up to 100 times greater. So if we really want to understand how stars like our Sun formed in the universe, we need to look billions of years into the past.

Since a star's light takes so long to reach us, how do we know that the star is still there? -Space

Description : Since a star's light takes so long to reach us, how do we know that the star is still there? -Space

Last Answer : We don't know that it is still there. For all we know, the North Star or any other star could have been ingested by a passing black hole years ago. (Although this is highly unlikely, it is ... years ago. It is entirely possible that some of the stars you see tonight do not actually exist anymore.

What quantity of stuff falls inexorably past the event horizon of the M87 black hole, never to be seen again, during the span of a single day? -Space

Description : What quantity of stuff falls inexorably past the event horizon of the M87 black hole, never to be seen again, during the span of a single day? -Space

Last Answer : The equivalent of 90 Earths

How is time changed in a black hole? -Space

Description : How is time changed in a black hole? -Space

Last Answer : As you get closer to a black hole, the flow of time slows down, compared to flow of time far from the hole. (According to Einstein's theory, any massive body, including the Earth, produces this effect.Near a black hole, the slowing of time is extreme.

The M87 black hole is supermassive, but relatively compact for its mass. What size does it occupy? -Space

Description : The M87 black hole is supermassive, but relatively compact for its mass. What size does it occupy? -Space

Last Answer : Such incredibly compact objects cause infinite curvature in the fabric of spacetime. Everything that falls into a black hole is sucked toward the singularity. At some distance away from the singularity ... star. Black holes grow by accreting surrounding matter and by merging with other black holes.

What are black holes with mass satisfying the Ker-Newman inequality called? -Space

Description : What are black holes with mass satisfying the Ker-Newman inequality called? -Space

Last Answer : answer:

How Big is a Solar Mass? -Space

Description : How Big is a Solar Mass? -Space

Last Answer : Or, more precisely, it's 1.989 x 10^30 kilograms — about 333,000 Earths. Astronomers use a solar mass as a basic unit of mass.

What would change if our Sun was suddenly replaced by a black hole of the same mass? -Space

Description : What would change if our Sun was suddenly replaced by a black hole of the same mass? -Space

Last Answer : Our Sun is too small a star to end its life as a black hole. But what would happen if the Sun were suddenly replaced with a black hole of the same mass? Contrary to popular belief, the Solar System would not be sucked in: a solar-mass black hole would exert no more gravitational pull than our Sun.

If photons (light) have no mass, how can they be trapped by the gravitational field of a black hole? -Space

Description : If photons (light) have no mass, how can they be trapped by the gravitational field of a black hole? -Space

Last Answer : Although photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them. According to Einstein's theory of gravity, it is energy, not mass, that feels the gravitational force. That's the short answer

What would happen if a trickster alien replaced the Sun with a black hole of the same mass? -Space

Description : What would happen if a trickster alien replaced the Sun with a black hole of the same mass? -Space

Last Answer : Our Sun is too small a star to end its life as a black hole. But what would happen if the Sun were suddenly replaced with a black hole of the same mass? Contrary to popular belief, the Solar System would not be sucked in: a solar-mass black hole would exert no more gravitational pull than our Sun.

How do scientists calculate the mass of a supermassive black hole? -Space

Description : How do scientists calculate the mass of a supermassive black hole? -Space

Last Answer : To determine the mass of NGC's black hole, Gallo and her fellow researchers employed reverberation mapping. This technique measures mass by monitoring radiation thrown off by what's called an accretion ... An accretion disk is a mass of matter collected by the gravitational pull of black holes.

How does dissolving a salt molecule in water make its atoms ionize? -Space

Description : How does dissolving a salt molecule in water make its atoms ionize? -Space

Last Answer : When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.

How black hole has a vast attractive force? What is its density in comparison with Earth and Sun? -Space

Description : How black hole has a vast attractive force? What is its density in comparison with Earth and Sun? -Space

Last Answer : There are two things that affect the escape velocity - the mass of object and the distance to the center of that object. For example, a rocket must accelerate to 11.2 km/s in order to escape Earth's gravity ... the mass of our sun would need to be squeezed into a volume with a radius of about 3 km.

The black hole is approximately 55 million light years away, how was its existence known and how was it pictured with just telescopes? -Space

Description : The black hole is approximately 55 million light years away, how was its existence known and how was it pictured with just telescopes? -Space

Last Answer : The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic ... matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.

Can a black hole run out of it's lifetime and die? -Space

Description : Can a black hole run out of it's lifetime and die? -Space

Last Answer : Hawking radiation reduces the mass and rotational energy of black holes and is therefore also known as black hole evaporation. Because of this, black holes that do not gain mass through other ... and ultimately vanish. For all except the smallest black holes, this would happen extremely slowly.

A black hole 'belches' light and radiation whenever something falls into its event horizon. What does that mean and why does that happen? -Space

Description : A black hole 'belches' light and radiation whenever something falls into its event horizon. What does that mean and why does that happen? -Space

Last Answer : A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole's “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos

What do we call the boundary around a black hole where nothing can escape its gravity? -Space

Description : What do we call the boundary around a black hole where nothing can escape its gravity? -Space

Last Answer : The boundary of the region from which no escape is possible is called the event horizon.

What is the temperature on the ISS (International Space Station)?

Description : What is the temperature on the ISS (International Space Station)?

Last Answer : It's apparently about 24 degrees C. The heating system is probably both very simple and hilariously complicated depending on how you look at life. Think about it - it's a sealed box surrounded by ... it's minus 247. The trick is to keep hold of the heat you produce without cooking everything.

Forget about the price. Would you want to be launched into space for 10-15 minutes and be weightless? What a rush!

Description : Forget about the price. Would you want to be launched into space for 10-15 minutes and be weightless? What a rush!

Last Answer : Nope. I hear a lot of people throw up. No thanks.

Did we get a message today recently from outer space?

Description : Did we get a message today recently from outer space?

Last Answer : Reading the article, it points out that it could be quite a number of things. I wouldn't put my money on it being a signal from an extraterrestrial species. We have received signals in the past that we ... it being aliens only for it to turn out to be a pulsar (a rotating neutron star) or something.

If we were to redo the Voyager space probes with modern technology then what would be the difference?

Description : If we were to redo the Voyager space probes with modern technology then what would be the difference?

Last Answer : Everything would be better except for the power supply. The original probes were basically nuclear powered. Can’t really get away with launching radioactive materials these days.

Are survivalists like Doomsday Preppers building shelters in outer space yet?

Description : Are survivalists like Doomsday Preppers building shelters in outer space yet?

Last Answer : If they’re smart enough to build a vast financial empire, they’re probably smart enough to realize that there’s not much that can be done to fight the end of the world. A bunker is probably a lot safer and more practical, perhaps a lair in a volcano would be even safer than that.

Can space junk be mined for metals and minerals?

Description : Can space junk be mined for metals and minerals?

Last Answer : Right now the cost to do it would outweigh what they could get for it. And it can also be pretty dangerous I would guess, too. It would be a good idea to get it down. What kinds of materials are ... I could imagine how some of our frenemies would feel if we snaked some of their old stuff to look at.

How long would an astronaut last in space if they were separated from the station and drifted off?

Description : How long would an astronaut last in space if they were separated from the station and drifted off?

Last Answer : Around 7 hours before his oxygen system will give out.

How can space expand between individual hydrogen atoms? [Strange Universe Series, 2011]

Description : How can space expand between individual hydrogen atoms? [Strange Universe Series, 2011]

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If Space is emptiness, what does gravity grab to bend it? (Strange Universe series)

Description : If Space is emptiness, what does gravity grab to bend it? (Strange Universe series)

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Is anyone else sad that Nasa's space shuttle program is shutting down?

Description : Is anyone else sad that Nasa's space shuttle program is shutting down?

Last Answer : Yes.

Are they going to renew the space shuttles when the ones now are put into retirement?

Description : Are they going to renew the space shuttles when the ones now are put into retirement?

Last Answer : answer:Last I heard, NASA's looking at zero space vehicles, thanks to a certain elected official's massive funding cuts. Needless to say, the guys at NASA are peeved. There is ... The space elevator, a longtime favorite, still faces some technological hurdles before serious development can begin.

What is your image of Space going on forever?

Description : What is your image of Space going on forever?

Last Answer : The only way I can translate the image in my head to text is this: ∞.

Is compressing files worth it if only a few KB's of space are saved?

Description : Is compressing files worth it if only a few KB's of space are saved?

Last Answer : No, not that useful. I mean, I suppose in the long-long run, it’ll add up, but I don’t think the effect would be that great or useful to you. I would say you are better off just getting more storage.

Is there really an up/down, left/right, north/south in space?

Description : Is there really an up/down, left/right, north/south in space?

Last Answer : directions are three dimensional in space, (perhaps more) and the up/down, left/right, north/south directions refer more to two dimensional maps. Pluto misses you as well, and sends its’ love.

Do you think that with all the space crafts going up into space is damaging the ozone?

Description : Do you think that with all the space crafts going up into space is damaging the ozone?

Last Answer : I don’t think it works like that. The ozone layer is gas. It’s not like a balloon where the rockets are punching wholes in it. It’s more like a submarine in the ocean. As it goes down, the water just takes it’s place. Same concept applies here. The gasses don’t stay torn apart.

On the space shuttle I have seen pictures with a covering over the tail end. What is this for?

Description : On the space shuttle I have seen pictures with a covering over the tail end. What is this for?

Last Answer : Aerodynamics when it’s being shipped back to Cape Canaveral. It reduces drag so that when piggy-backed on the 747, it doesn’t cause undo dragand air resistance.

Inner Earth or Outer Space- which would you prefer to explore?

Description : Inner Earth or Outer Space- which would you prefer to explore?

Last Answer : Inner space. It feels almost as infinite, and a bit more reasonable to reach.

Is this one reason men need space?

Description : Is this one reason men need space?

Last Answer : Men can be very single minded when it comes to women in a new relationship especially. We want you around but know we can not concentrate on anything else if you are there. Give us our space as necessary, accept us as morons and love us anyway.

How many heat tiles on the space shuttle?

Description : How many heat tiles on the space shuttle?

Last Answer : www.google.com

How far does space go?

Description : How far does space go?

Last Answer : No straight line. Follow the energizer bunny.

Think of this: space?

Description : Think of this: space?

Last Answer : there is most def other life out there “if not that’s an awful lot of wasted space”

How far up is space, in miles.

Description : How far up is space, in miles.

Last Answer : I’m not sure what you mean. Space is infinite.

Does anyone else find themselves a little creeped out by space?

Description : Does anyone else find themselves a little creeped out by space?

Last Answer : One that really got me when I was younger was, trying to figure the shape of space! Everything that we know of has some sort of shape, but what about space?

he first space rocket brought back to earth after orbiting the moon -Space

Description : he first space rocket brought back to earth after orbiting the moon -Space

Last Answer : Zond-5 is the right answer

The first unmanned moon buggy to explore surface of the moon -Space

Description : The first unmanned moon buggy to explore surface of the moon -Space

Last Answer : Lunakhod-1 (U.S.S.R.) is

The first space-vehicle to orbit the moon -Space

Description : The first space-vehicle to orbit the moon -Space

Last Answer : Luna-10 (U.S.S.R.) is answer

The first country to send man to the moon -Space

Description : The first country to send man to the moon -Space

Last Answer : This includes both crewed and robotic missions. The first human-made object to touch the Moon was the Soviet Union's Luna 2, on 13 September 1959. The United States' Apollo 11 was the first crewed mission to land on the Moon, on 20 July 1969.

The first spaceship which carried three American astronauts to land two of them on the moon -Space

Description : The first spaceship which carried three American astronauts to land two of them on the moon -Space

Last Answer : The Apollo 11 Command Module Columbia carried astronauts Neil Armstrong, Edwin "Buzz" Aldrin, and Michael Collins on their historic voyage to the Moon and back on July 16-24, 1969. During the mission, astronauts Armstrong and Aldrin became the first human explorers of another world.

The first manned space vehicle to land on the moon -Space

Description : The first manned space vehicle to land on the moon -Space

Last Answer : Apollo 11 was the first manned mission to land on the Moon. The first steps by humans on another planetary body were taken by Neil Armstrong and Buzz Aldrin on July 20, 1969. The astronauts also returned to Earth the first samples from another planetary body.

The first unmanned spaceship to have soft landed and lifted off from the moon to return to the earth -Space

Description : The first unmanned spaceship to have soft landed and lifted off from the moon to return to the earth -Space

Last Answer : Luna-16 (U.S.S.R.) September 21, 1970

The first woman cosmonaut of the world -Space

Description : The first woman cosmonaut of the world -Space

Last Answer : Velentina Tereshkova