Heimildir
https://www.google.is/search?q=reikistj%C3%B6rnurnar&espv=2&biw=1422&bih=1020&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiWp46em5TSAhWFJMAKHWB2B_wQ_AUIBigB#tbm=isch&q=gervitungl&imgrc=K4vRkGMaeprimM
https://www.stjornufraedi.is/alheimurinn/rannsoknir/
http://www.geimurinn.is/solkerfid/solkerfid-okkar
http://www.visindavefur.is/svar.php?id=339
http://www.geimurinn.is/solkerfid/solkerfid-okkar
http://www.geimurinn.is/alheimurinn/lif-i-alheimi
http://ingasigrun.wixsite.com/nemendurvalsarskola/er-lf--okkar-slkerfi
https://www.stjornufraedi.is/solkerfid/halastjornur/
https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-satellite-58.html
https://www.google.is/search?q=space+planets&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjGr8bs6IzSAhVBFMAKHW0_AAAQ_AUICCgB&biw=1422&bih=1020#imgrc=EsDMJ_-LSIZo6M:
https://www.google.is/search?q=reikistj%C3%B6rnurnar&espv=2&biw=1422&bih=1020&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiWp46em5TSAhWFJMAKHWB2B_wQ_AUIBigB#tbm=isch&q=planets&imgrc=g2dC5peAwmaVZM:
https://www.google.is/search?q=reikistj%C3%B6rnurnar&espv=2&biw=1422&bih=1020&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiWp46em5TSAhWFJMAKHWB2B_wQ_AUIBigB#tbm=isch&q=gervitungl&imgrc=K4vRkGMaeprimM:
https://www.google.is/search?q=geimfari&espv=2&biw=1422&bih=965&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiY3qvtnZTSAhVlKsAKHfSwDJAQ_AUIBigB#tbm=isch&q=astronaut&imgrc=Jv0TROr31XQLOM:
https://www.google.is/search?q=geimfari&espv=2&biw=1422&bih=965&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiY3qvtnZTSAhVlKsAKHfSwDJAQ_AUIBigB#tbm=isch&q=alien&imgrc=5iiReJq62Q815M:
https://www.stjornufraedi.is/alheimurinn/rannsoknir/
http://www.geimurinn.is/solkerfid/solkerfid-okkar
http://www.visindavefur.is/svar.php?id=339
http://www.geimurinn.is/solkerfid/solkerfid-okkar
http://www.geimurinn.is/alheimurinn/lif-i-alheimi
http://ingasigrun.wixsite.com/nemendurvalsarskola/er-lf--okkar-slkerfi
https://www.stjornufraedi.is/solkerfid/halastjornur/
https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-satellite-58.html
https://www.google.is/search?q=space+planets&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjGr8bs6IzSAhVBFMAKHW0_AAAQ_AUICCgB&biw=1422&bih=1020#imgrc=EsDMJ_-LSIZo6M:
https://www.google.is/search?q=reikistj%C3%B6rnurnar&espv=2&biw=1422&bih=1020&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiWp46em5TSAhWFJMAKHWB2B_wQ_AUIBigB#tbm=isch&q=planets&imgrc=g2dC5peAwmaVZM:
https://www.google.is/search?q=reikistj%C3%B6rnurnar&espv=2&biw=1422&bih=1020&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiWp46em5TSAhWFJMAKHWB2B_wQ_AUIBigB#tbm=isch&q=gervitungl&imgrc=K4vRkGMaeprimM:
https://www.google.is/search?q=geimfari&espv=2&biw=1422&bih=965&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiY3qvtnZTSAhVlKsAKHfSwDJAQ_AUIBigB#tbm=isch&q=astronaut&imgrc=Jv0TROr31XQLOM:
https://www.google.is/search?q=geimfari&espv=2&biw=1422&bih=965&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiY3qvtnZTSAhVlKsAKHfSwDJAQ_AUIBigB#tbm=isch&q=alien&imgrc=5iiReJq62Q815M: