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Since Pluto was ousted to keep out thousands of irregular orbiters of Sol, the clear definition of the word 'planet' has been: a celestial body moving in an elliptical orbit around a star
The JWST has now achieved L2 orbit - in line with Earth's orbit of Sol. So does it now count as a planet, or is mass an issue?
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Mass is only an issue for Roman Catholics.
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The IAU in 2006 defined 3 criteria for a planet:
- It must orbit a star (in our cosmic neighborhood, the Sun).
- It must be big enough to have enough gravity to force it into a spherical shape.
- It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.
The JWST arguably fits criterion 1, but not 2 or 3.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Good to know.
So according to Richard, the IAU is Catholic  Mass matters 
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No, all planets are Catholic - they have Mass.
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Hey, I have mass, but I'm neither Catholic nor a planet.
If you think 'goto' is evil, try writing an Assembly program without JMP.
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catholic (small 'c') - 'including a wide variety of things; all-embracing'.
So everything is catholic except light, which has no mass. They were right all along... 
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obermd wrote: they have Mass.
But do they celebrate it? 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Nothing says "Oh we are a planet ruled by a Celestial Body" now by eating some crackers and wine. 
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So, not a planet nor a dwarf planet according to the IAU, but maybe a small Solar System body, defined as "... all objects orbiting the Sun that are too small (not sufficiently massive) to satisfy the definition of planet or dwarf planet."
If you think 'goto' is evil, try writing an Assembly program without JMP.
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Well technically, that includes you and me, doesn't it? We orbit the sun via a complex interaction with the spinning Earth ... given that "orbit" is defined as:
Quote: ... the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, such as the sun.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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So, you're suggesting we're all Moonies.
If you think 'goto' is evil, try writing an Assembly program without JMP.
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Lunatics!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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A Small Solar System Body (SSSB) has an orbit centred on the Sun. A natural satellite (such as the Moon) has an orbit centred on a planet, dwarf planet, or SSSB. We have no orbit independent of the Earth, therefore we fall into neither category - from the astronomical perspective, we are merely parts of the Earth.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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It is now what is called a trojan satellite.
It orbits the same orbit as earth at its Lagrange point. (which is one of two spots a planet's orbital can share. Either ahead or behind of the planet.)
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Except that JWST is orbiting L2, which is 1.5 million kilometers straight out from the Earth with the Earth directly between it and the Sun. I thought the Trojan points were specifically the two stable L points at +/- 60 degrees from the planetary body.
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Woo hoo! More to learn! Thanks for the pointer!
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You are quite right. Originally Trojan Points were defined as being L4 and L5 of the Jupiter solar orbit, but later came to be adopted for all planet/sun configurations at the L4 and L5 points. Thus, the JWST is not a Trojan.
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Container with a point to make (6)
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
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Container with a point to make (6)
Container = Crate
with a point = E
CREATE
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Well done David YAUT
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
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Parse error: syntax error, unexpected variable "$query" in C:\xampp\htdocs\sys\functions.php on line 10
here is the code -
<?php
function check_login($con)
{
if(isset($_SESSION['user_id']))
{
$id = $_SESSION["user_id"]
$query = "select * from users where user_id = '$id' limit 1";
$result = mysqli_query($con,$query);
if($result && mysqli_num_rows($result) > 0)
{
$user_data = mysqli_fetch_assoc($result);
return $user_data;
}
}
}
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You should read the posting rules, the top entry in this list. You could read there that this is the wrong place for your question.
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