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HTML 

              
                <div class="solar-system">
  <div id="sun"></div>

  <div class="orbit mercury-orbit"></div>
  <div class="mercury-spin">
    <div id="mercury"></div>
  </div>

  <div class="orbit venus-orbit"></div>
  <div class="venus-spin">
    <div id="venus"></div>
  </div>

  <div class="orbit earth-orbit"></div>
  <div class="earth-spin">
    <div class="orbit moon-orbit"></div>
    <div class="moon-spin">
      <div id="moon"></div>
    </div>

    <img id="earth" src="https://raw.githubusercontent.com/everdimension-personal/codepen-assets/master/earth_small_150.jpg" />
  </div>

  <div class="orbit mars-orbit"></div>
  <div class="mars-spin">
    <div id="mars"></div>
  </div>
</div>
!

CSS 

              
                html,
body {
  /* width: 100%;
  height: 100%; */
  background-color: #121215;
}

.solar-system {
  position: relative;
  width: 780px;
  height: 780px;
  margin: auto;
  overflow: hidden;
}

/* Some positioning rules that are common for all objects */
.orbit {
  border: 1px dashed #666;
}

#sun,
.orbit,
.orbit + div,
.orbit + div > div {
  position: absolute;
}

#sun,
.orbit,
.orbit + div {
  top: 50%;
  left: 50%;
}
.orbit + div > div {
  top: 0;
  left: 50%;
}

.orbit,
.orbit + div div,
#earth {
  border-radius: 50%;
}

/* Individual objects rules. They are pretty much the same for 
all objects and basically only vary in orbit size 
and planet size. And colors :) */

#sun {
  /* Positions the top-left corner of the image to be *
	/* in the middle of the box */
  height: 200px;
  width: 200px;
  background-color: #fae20a;
  margin-top: -100px;
  margin-left: -100px;
  border-radius: 50%;
  box-shadow: 0 0 84px orange;
}

#earth {
  position: absolute;
  top: 0;
  left: 50%;
  height: 50px;
  width: 50px;
  margin-left: -25px;
  margin-top: -25px;
  border-radius: 50%;
  box-shadow: 0 0 34px #3a4385;
}

.earth-orbit,
.earth-spin {
  width: 500px;
  height: 500px;
  margin-left: -250px;
  margin-top: -250px;
}

#moon {
  margin-top: -6px;
  margin-left: -6px;
  height: 12px;
  width: 12px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 0 14px #3a4385;
}
.moon-orbit,
.moon-spin {
  height: 90px;
  width: 90px;
  margin-top: -45px;
  margin-left: -45px;
  border-color: #447;
}

#venus {
  margin-top: -20px;
  margin-left: -20px;
  height: 40px;
  width: 40px;
  background-color: #3498db;
  box-shadow: 0 0 34px #3a4385;
}
.venus-orbit,
.venus-spin {
  margin-top: -185px;
  margin-left: -185px;
  width: 370px;
  height: 370px;
}

#mercury {
  margin-top: -13.5px;
  margin-left: -13.5px;
  height: 25px;
  width: 25px;
  background-color: #a65e22;
  /* box-shadow: 0 0 34px #3a4385; */
}

.mercury-orbit,
.mercury-spin {
  width: 280px;
  height: 280px;
  margin-left: -140px;
  margin-top: -140px;
}

#mars {
  margin-top: -16px;
  margin-left: -16px;
  height: 32px;
  width: 32px;
  background-color: #863222;
  box-shadow: 0 0 14px #a64232;
}

.mars-orbit,
.mars-spin {
  width: 700px;
  height: 700px;
  margin-left: -350px;
  margin-top: -350px;
}

/* Spinning animations */

@keyframes spin-right {
  100% {
    transform: rotate(360deg);
  }
}

.earth-spin {
  animation: spin-right 36.5s linear infinite;
}
.moon-spin {
  animation: spin-right 3s linear infinite;
}
.venus-spin {
  animation: spin-right 22s linear infinite;
}
.mercury-spin {
  animation: spin-right 8.8s linear infinite;
}
.mars-spin {
  animation: spin-right 68.7s linear infinite;
}
!

JS
!
999px

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