Deep Space Communication Complex

[BigP]

""We don't know whether Mars has a molten core or not; we want to know what's going on in the mantle structure.""


May have at some point , when the planet had an atmosphere and liquid water on its surface

I suspect it doesn't have a molten core anymore and when that stopped the magnetic field stopped and then the solar winds could strip the attmosphere away. A real pity. If it was a little larger we would have earth 2.

A molten core is key to keeping your attmosphere.

Are you saying water is not important for an atmosphere?

Atmosphere is important for water,

Did I ask you?

I thought we were on a first name basis after our intimate encounter

[BigP]

""We don't know whether Mars has a molten core or not; we want to know what's going on in the mantle structure.""


May have at some point , when the planet had an atmosphere and liquid water on its surface

When did it have water?

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

[Super Nova]

""We don't know whether Mars has a molten core or not; we want to know what's going on in the mantle structure.""


May have at some point , when the planet had an atmosphere and liquid water on its surface

When did it have water?

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

[WellWisher]

The Dish a great aussie movie is based in this building awesome movie and exciting time in science.

The Dish was actually based on the Parkes' Radio-Telescope located at Parkes NSW, not the Tidbinbilla telescope.

Soon as I read Parkes I knew I had it wrong

[WellWisher]

When did it have water?

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

could of it been ammonia or another liquid ?

[BigP]

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

could of it been ammonia or another liquid ?

Liquid ammonia boils at arond -33c at 1 atmosphere, so not very likely

[Malcolm_hates_your_kids]

When did it have water?

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

So how come the pressure changed?

[BigP]

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

So how come the pressure changed?

So how come you are being so amicable ?

[Malcolm_hates_your_kids]

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

So how come the pressure changed?

So how come you are being so amicable ?

Don't you like answers?

[Super Nova]

The various rovers have indentified signs of erosion which can only be present if there was surface water at some point

Is water the only liquid that could have done it?

Given the size of the planet, the answer would be yes

Agree. That have studies the crystal and compounds in on mars and concluded it was water. Plus there appears to be flood plains... water is the only thing that could have made them.

Liquid Water is conditional to pressure on it. That is, the less pressure the lower the boiling point. In a vaccum it just vaporizes. So no atmosphere, no liquid water on surface. Mars as very low pressure atmosphere, 0.6% of the Earth at sea level. What was there, evaporated and got blown away in the solar winds with the rest of it.

Interesting factoid.

The triple point of water is 32°F (0°C) and 6 millibars (a bar is one atmosphere of pressure). The triple point of water exists on the surface of Mars: You could hold a beaker of boiling water on the martian surface that had ice cubes floating in it, and the ice cubes wouldn't melt because the liquid water would be at the freezing point.

So how come the pressure changed?

When the core stopped making the magnetic field that protects the planet from the solar wind, the attmosphere was progressively stripped away.... as it gets stripped away the amount of attmosphere reduces, the pressure drops.

Also the gravity is less than earth so it was stripped away more quickly than it would happen on Earth. Then you get a run away situation, when it get too low, all the water is vapour then it too can be stripped away.