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Kaunisto Profile
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Re: Astronomy News


It's coming right for us!
(that's a South Park reference)

]A whole other star is on a crash course with our solar system
quote:

We spend a lot of time worried about asteroids that might one day impact our planet. But what if a whole star threatened to collide with us?

Well, in around [sign in to see URL] million years, that's close to what might happen. Scientists have been plotting the course of a rogue star, Gliese 710, which currently sits in the constellation of Serpens some 64 light years from Earth. Turns out, it's headed straight for us, reports Forbes.

The star isn't scheduled to collide directly with Earth, but it will be passing through our solar system's Oort Cloud, a shell of countless comets and other bodies in the outer reaches of the Sun's gravitational influence. You might think that's a safe distance, but the star is likely to slingshot comets all over the solar system, and one of those could very well have our name on it.

“Gliese 710 will trigger an observable cometary shower with a mean density of approximately ten comets per year, lasting for three to 4 million years,” wrote the study's co-authors.

Gliese 710 is only half the size of our sun, but if there are still people around in [sign in to see URL] million years to observe the event, the star will appear as the brightest and fastest object in the night sky. It's bizarre to imagine that our solar system will house a whole other star, even if it is only supposed to pass through the Oort Cloud. Gliese 710 won't be sticking around; eventually it will curb around the sun and be on its way, but not before wreaking some havoc.

Scientists calculated that Gliese 710 is the star that's expected to come closest to us within the next 10 million years (which is as far ahead as scientists could project), but it's not the only close encounter. As many as 14 other stars could come within 3 light-years distance in the next few million years, and there are numerous fainter, red dwarf stars with unknown trajectories that could be headed our way too.

So perhaps we should be grateful that we live in the relatively isolated solar system that we do today.



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Dec/29/2016, 17:02 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]New record-breaking brown dwarf is 'purest' and most massive

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Mar/25/2017, 0:03 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


Now they've found smallest star yet, one actually smaller than planet Jupiter (in size, I don't know of mass). This is considered to be about as small as a star can be, otherwise it wouldn't burn and was just a lightless brown dwarf.

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Jul/13/2017, 14:02 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


Say hello to 1I/'Oumuamua

]First Visitor From Outside Our Solar System Has a Name and an Origin

(Very vague origin though, more of a direction it came from.)

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Nov/10/2017, 16:00 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


Voyager still works emoticon

]NASA turns to Voyager’s dormant thrusters for first time in 37 years – and they work!

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Dec/2/2017, 17:39 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]A Star Grazed Our Solar System 70,000 Years Ago, and Early Humans Likely Saw It

%27s_star]Scholz's star is one of (tens of) nearest stars from us, but it was found only recently because it is very dim and for another more interesting reason: it has passed our solar system very close and therefore is now moving straight away from us. That makes it harder to observe than objects that move "sideways".
It is a binary system where the actual red dwarf star has a brown dwarf companion.

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Mar/22/2018, 19:03 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]Dozen more moon found for Jupiter
quote:

Astronomers are still finding moons at Jupiter, 400 years after Galileo used his spyglass to spot the first ones.

The latest discovery of a dozen small moons brings the total to 79, the most of any planet in our solar system.

quote:

Galileo detected Jupiter's four largest moons, Io, Europa, Ganymede and Callisto in 1610. The latest count of 79 known planets includes eight that have not been seen for several years. Saturn is next with 61, followed by Uranus with 27 and Neptune with 14. Mars has two, Earth has one and Mercury and Venus have none.



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Jul/17/2018, 22:49 Link to this post Send PM to Kaunisto
 
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(see above post)

I started to look into this and here's a little personal fact: when my grandfather was born, the Galilean four were still the only known moons of Jupiter. 38 moons (if you count Charon, orbiting dwarf planet) and Pluto were found during his long lifetime - twice as many as were known when he was born.

But in my lifetime, over 150 moons have been found, and several dwarf planets.

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Jul/19/2018, 12:17 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]First exomoon found


First moon has been found in another star system and it's a big one: vastly bigger than Earth or any moon in our solar system, closer to gas giant planets Neptune and Uranus.
Also like those the moon is gaseous, unlike all previously known rocky moons.

It makes sense that a very large moon is the first found, but this does change our perspective on moons and planets (possibly restarting the debate about definitions of planet, dwarf planet, moon etc.)

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Oct/3/2018, 23:26 Link to this post Send PM to Kaunisto
 


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