The sun-a lot of energetic particles, easy to make sudden bursts. The natural radiation sources is a big problem. The space environment are very danger.
The eight planets in the space are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Only earth can support the live because it is the correct distance from the sun, and light. Earth's rocky crust provides a stable surface for life, unlike gas giants, such as Jupiter . Earth has water, water is the most important for the life. Earth have suitable climate, the temperature of earth does not go from one extreme to the other either. The Jupiter also have water, but the water is in under the ice surface.
The history of the constellation: different constellation appear at sunset.
There have 12 constellations. Constellations are make from start.
Pisces: Feb. 19 - Mar. 20. best viewed in the sky during the month of the October.
Website: https://www.reference.com/science/earth-support-life-5fd50bdfdc547b7, http://www.eightplanetsfacts.com/, http://www.esa.int/Our_Activities/Space_Engineering_Technology/Space_Environment/Introduction_to_space_environment, http://www.astromax.org/con-page/con-12.htm, http://www.space.com/15722-constellations.html, http://www.bobthealien.co.uk/earthlife.htm