Questions tagged [earth]

Questions of the science and space exploration related to Earth.

12 questions with no upvoted or accepted answers
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Could Breakthrough Starshot be used to deflect asteroids and comets?

Would Breakthrough Starshot be able to deflect an asteroid or comet? I have seen thoughts about using the lasers that would launch Breakthrough Starshot to deflect asteroids or comets: https://www....
6
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1answer
120 views

Do astronauts on ISS notice Earth's seasons?

Has anyone stationed on the ISS for some months reported noticing the changing seasons on Earth in any way like people on the surface do, subconsciously without needing to look up numbers for anything?...
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0answers
44 views

How to convert body coordinate from Sun reference frame to Earth reference frame?

I have the coordinates of a celestial body w.r.t. Sun , expressed as (x,y,z), at a given time. I need to move this coordinates into a reference frame centered on Earth center, but after reading dozens ...
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0answers
161 views

What is the acceleration necessary for a Brachistochrone transfer from Earth to Mars?

With these orbital configurations, source-Bing leaving Earth on Aug 16, 2106 and arriving on Mars October 10,2106, what is the lowest continuously-applied acceleration that can make what is ...
2
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0answers
117 views

Orbiting clock visible with the naked eye

Does anyone remember from the 1980s or possibly early '90s in the UK news a (serious) story about contructing a huge orbiting clock so that people would be able to look up at the sky to read the time ...
2
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0answers
47 views

Why did DSCOVR increase its pictures rate on February 3rd 2018?

On February 3rd for some reason NASA tuned up DSCOVR to send images of the Earth every 20min instead of the regular 2 hours interval. Last time they did this was for the great USA solar eclipse, in ...
1
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0answers
39 views

J2000 to current ECI transformation matrix

I want to find the transformation matrix that converts an ECI frame at some time 't' (lets say t = 1st January 2020) to J2000 ECI frame (that is ECI frame at noon of 1st January 2000). From what I ...
1
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0answers
24 views

magnitude of magnetic anomalies (Earth and Mars)

I've been looking for the magnitude of highest and lowest magnetic anomalies on Earth and Mars (mapped by spacecraft in low orbit), by searching online I couldn't really find a numerical value. From ...
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0answers
85 views

Calculate Satellite ground track

I'm trying to find equations to calculate satellite position based on orbit parameters and given time. What I currently have is a mess that is basically giving me bunch of garbage. What is latitude ...
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0answers
24 views

Can any aspect of the brightness of Martian twilight be determined by Curiosity's photo of Earth?

Curiosity took this image of Earth on Jan. 31, 2014, 80 minutes after sunset. Stellarium has the Earth >15° above the horizon 80 minutes after sunset on that day. With Stellarium indicating the ...
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0answers
154 views

What is the highest resolution of infrared photography of Earth available from satellites?

What is the best resolution of infrared photo taken from space of earth? Is it possible to see on this picture, for example, animals or humans (temperature of body is different than ground)? Is it ...
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0answers
30 views

If I know the masses, positions, and velocities of two objects, how do I calculate their trajectories under gravity?

I was thinking about the effect of a near-miss with an asteroid upon the orbit of the earth around the Sun. My goal is to figure out a formula I could use for a visualization I'd like to build to get ...