So I was sitting here watching theses and I was wondering... Why are planets round?

The bigger an object is the more gravity it has. An extremly large object (like Mars or Earth) has enough gravity to pull itself into a sphere. A smaller object (like Mars' moons or most asteroids) do not have enough gravity to do so. That is why they are all odd and lumpy.

What is the music on the video? Is it written just for this video? (It reminds me a bit of the awesome "O Fortuna" from "Carmina Burana by Carl Orff!)

The European Space Agency (ESA) site listing for this video says "Music: B. Lynne." B. Lynne is Bjorn Lynne who is, according to Wikipedia, a Norwegian sound engineer and music composer. A Google search for "Bjorn Lynne" will yield tons of information -- his web site, many youtube videos, etc.

How do you keep a satellite running for such long times?

Well, usually they launch the satellite, then the satellite orbits the Earth because of the magnetic pull, then when it needs repairs, it gets sent back down to Earth, gets fixed, and sent back up into space where the cycle begins again.

Are there earthquakes on Mars? Are they equal to that of Earth's?

They probably did. They think it still does, due to the pit chains on Mars.

If there used to be liquid water on mars, wouldn't mars used to be warmer? For all I know that would mean mars would have been closer to the sun. Could there be a different reason?

Mars likely had a thicker atmosphere with a more substantial greenhouse effect back then.

what happens if the satellites brake down?

If they BRAKE down that means they would be slowing down, right? But if they BREAK down, which is what you probably meant, then we would not be able to obtain data from them anymore. If possible, they would need to be repaired.

how is there no water on mars now? (if there ever was).

Because of the lack of proper heat from the Sun, the water slowly started freezing up because of the dropping temperature levels. Now, it is completely frozen.

When was the Mars express launched?

Mars Express was launched on June 2, 2003 at 17:45 UT.

About how much does a satillite cost -roughly-

The cheapest satellites can cost about $10,000, but it would cost $70 million or more to send a satellite to Mars. A Mars lander would cost somewhere between $300 million and $3 billion.

Main content

Mars express

Google Classroom

Summary of the Mars Express Orbiter.

For more information check out the mission page.

. Created by NASA.

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νσŕαχε
Posted 9 years ago. Direct link to νσŕαχε's post “So I was sitting here wat...”
So I was sitting here watching theses and I was wondering... Why are planets round?
Button navigates to signup pageComment on νσŕαχε's post “So I was sitting here wat...”
(8 votes)
Answer
- elijah
  Posted 8 years ago. Direct link to elijah's post “The bigger an object is t...”
  The bigger an object is the more gravity it has. An extremly large object (like Mars or Earth) has enough gravity to pull itself into a sphere. A smaller object (like Mars' moons or most asteroids) do not have enough gravity to do so. That is why they are all odd and lumpy.
  Comment on elijah's post “The bigger an object is t...”
  (32 votes)
L
Posted 9 years ago. Direct link to L's post “What is the music on the ...”
What is the music on the video? Is it written just for this video?
(It reminds me a bit of the awesome "O Fortuna" from "Carmina Burana by Carl Orff!)
Button navigates to signup pageComment on L's post “What is the music on the ...”
(6 votes)
Answer
- Walks on the Clouds
  Posted 8 years ago. Direct link to Walks on the Clouds's post “The European Space Agency...”
  The European Space Agency (ESA) site listing for this video says "Music: B. Lynne."
  B. Lynne is Bjorn Lynne who is, according to Wikipedia, a Norwegian sound engineer and music composer. A Google search for "Bjorn Lynne" will yield tons of information -- his web site, many youtube videos, etc.
  Button navigates to signup page
  (4 votes)
Aaron Shapiro
Posted 8 years ago. Direct link to Aaron Shapiro's post “When was the Mars express...”
When was the Mars express launched?
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(1 vote)
Answer
- patoof
  Posted 8 years ago. Direct link to patoof's post “Mars Express was launched...”
  Mars Express was launched on June 2, 2003 at
  17:45
  UT.
  Button navigates to signup page
  (5 votes)
NotMyRealUsername
Posted 9 years ago. Direct link to NotMyRealUsername's post “Are there earthquakes on ...”
Are there earthquakes on Mars? Are they equal to that of Earth's?
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(2 votes)
Answer
- nessithegreat9
  Posted 9 years ago. Direct link to nessithegreat9's post “They probably did. They t...”
  They probably did. They think it still does, due to the pit chains on Mars.
  Button navigates to signup page
  (2 votes)
David Cian
Posted 9 years ago. Direct link to David Cian's post “How do you keep a satelli...”
How do you keep a satellite running for such long times?
Button navigates to signup pageButton navigates to signup page
(3 votes)
Answer
- nessithegreat9
  Posted 9 years ago. Direct link to nessithegreat9's post “Well, usually they launch...”
  Well, usually they launch the satellite, then the satellite orbits the Earth because of the magnetic pull, then when it needs repairs, it gets sent back down to Earth, gets fixed, and sent back up into space where the cycle begins again.
  Comment on nessithegreat9's post “Well, usually they launch...”
  (5 votes)
AwesomeAnders
Posted 7 years ago. Direct link to AwesomeAnders's post “If there used to be liqui...”
If there used to be liquid water on mars, wouldn't mars used to be warmer? For all I know that would mean mars would have been closer to the sun. Could there be a different reason?
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- AegonTargaryen
  Posted 7 years ago. Direct link to AegonTargaryen's post “Mars likely had a thicker...”
  Mars likely had a thicker atmosphere with a more substantial greenhouse effect back then.
  Button navigates to signup page
  (2 votes)
michael
Posted 7 years ago. Direct link to michael's post “what happens if the satel...”
what happens if the satellites brake down?
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(2 votes)
Answer
- Victorianox :)
  Posted 7 years ago. Direct link to Victorianox :)'s post “If they BRAKE down that m...”
  If they BRAKE down that means they would be slowing down, right? But if they BREAK down, which is what you probably meant, then we would not be able to obtain data from them anymore. If possible, they would need to be repaired.
  Comment on Victorianox :)'s post “If they BRAKE down that m...”
  (2 votes)
Evangelina Velker
Posted 6 years ago. Direct link to Evangelina Velker's post “About how much does a sat...”
About how much does a satillite cost -roughly-
Button navigates to signup pageComment on Evangelina Velker's post “About how much does a sat...”
(1 vote)
Answer
- Reed
  Posted 6 years ago. Direct link to Reed's post “The cheapest satellites c...”
  The cheapest satellites can cost about $10,000, but it would cost $70 million or more to send a satellite to Mars. A Mars lander would cost somewhere between $300 million and $3 billion.
  Button navigates to signup page
  (4 votes)
sam
Posted 7 years ago. Direct link to sam's post “How is there ice water on...”
How is there ice water on Mars? Wouldn't water evaporate before it freezes because of low pressure?
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(2 votes)
Answer
Catguy
Posted 6 years ago. Direct link to Catguy's post “how is there no water on ...”
how is there no water on mars now? (if there ever was).
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(2 votes)
Answer
- Atreya Vedantam
  Posted 6 years ago. Direct link to Atreya Vedantam's post “Because of the lack of pr...”
  Because of the lack of proper heat from the Sun, the water slowly started freezing up because of the dropping temperature levels. Now, it is completely frozen.
  Comment on Atreya Vedantam's post “Because of the lack of pr...”
  (2 votes)

NASA

Course: NASA > Unit 3

Mars express

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Video transcript