How long it take light to reach Earth from all eight planets

 

Here’s how long it takes light to travel from each of the eight planets to Earth, based on their average distances from Earth. Since these distances vary due to elliptical orbits, I’ll use approximate average distances and the speed of light (299,792 km/s). Note that Earth’s distance from itself is zero, but I’ll include all eight planets as requested.

Mercury: Average distance from Earth is about 91 million km (varies as it’s closer to the Sun).

Time: 91,000,000 km ÷ 299,792 km/s ≈ 303 seconds ≈ 5 minutes and 3 seconds.

Venus: Average distance from Earth is about 41 million km.

Time: 41,000,000 km ÷ 299,792 km/s ≈ 137 seconds ≈ 2 minutes and 17 seconds.

Earth: Distance is 0 km (light from Earth’s surface to itself is instantaneous for practical purposes).

Time: 0 seconds.

Mars: Average distance from Earth is about 78 million km.

Time: 78,000,000 km ÷ 299,792 km/s ≈ 260 seconds ≈ 4 minutes and 20 seconds.

Jupiter: Average distance from Earth is about 628 million km.

Time: 628,000,000 km ÷ 299,792 km/s ≈ 2,094 seconds ≈ 34 minutes and 54 seconds.

Saturn: Average distance from Earth is about 1.275 billion km.

Time: 1,275,000,000 km ÷ 299,792 km/s ≈ 4,253 seconds ≈ 1 hour and 10 minutes.

Uranus: Average distance from Earth is about 2.723 billion km.

Time: 2,723,000,000 km ÷ 299,792 km/s ≈ 9,085 seconds ≈ 2 hours and 31 minutes.

Neptune: Average distance from Earth is about 4.5 billion km.

Time: 4,500,000,000 km ÷ 299,792 km/s ≈ 15,014 seconds ≈ 4 hours and 10 minutes.

These times fluctuate as planets move closer or farther from Earth in their orbits. For example, when Mars is at opposition (closest approach), light might take just over 3 minutes, while at its farthest, it could take closer to 4.5 minutes. Similarly, outer planets like Neptune can range from about 4 to 4.3 hours. These are averages for a general sense of scale.

Pluto    =   5.47 hrs.

Bud let gone

 by shaun lawton 

 We moved on 

   in an unexpected 

turbulent flowering,

a slowing torque corrupting  

  our facial suppositions 

 with grins to grind to a halt

    unwinding diverse looks

   Not channeling across

glances as expected

  when undergoing trans-

formations  under

 the repetitive lunar 

orbiting halo beginning

  to appear before

  the erasing of successive

 reverberations that intricately

   counterbalance the spin 

and rotation of a vague

    and distant exoplanetary 

 systemic process; to blame 

and then create balance

 forlorn and seasonally,

as if based on pasting 

  our feelings onto

 one photograph

and regarding the rest

  of the family album

 as an ongoing distribution

 network of constant rigid

reestablished tensions

 rippling from one side 

of the funneling inverse

 quadrant formed first 

cosmos through to 

the outer  lip curling

 parameter stretched

 along interior formations 

in blossoming

 flux we gathered by 

the banks of a river

 that ran against

   many rocks

   to cross on 

over to the

     other side 

Map of Light

Cosmic microwave background is the ancient light imprinted on the sky when the universe was about 370,000 years old. Today faint traces of this ancient light yet linger upon our vision, yet remarkably it is not evenly spread out across our universe. Extremely small fluctuations in this shroud of light which make it appear to be clotted are in fact the seeds from which grew the galaxies we see about us today.

The universe began in a hot, dense state which initially exploded outward at a rate far exceeding that of the speed of light.  Then it began to cool as it expanded...and here we are. 

from the European Space Agency Files

 The Planck telescope located in the L2

Planck Scanning the Sky: 
Experimental Cosmology is a Hot Topic

Planck will unravel the anisotropies in 
the Cosmic Microwave Background