Enceladus might offer the greatest possibility for Earth-like life in the Saturnian system, but perhaps life takes on a different form? With a thicker atmosphere than Earth, the second-largest moon in our Solar System, Titan, was found to have liquid methane on its surface: oceans, rivers and even waterfalls! Could life make use of methane on another world the same way it makes use of water on Earth?
Pregnancy symptoms at 6 weeks. For most women, morning sickness begins between 6 and 8 weeks. You may also be exhausted and experiencing mood swings, which could be due to hormonal changes as well as the stress of wondering what lies ahead in your pregnancy. About 25 percent of women have spotting in early pregnancy.ormally you get your period about 4 weeks from the start of your last period, but if you're pregnant, the clearest sign at this point is a missed period. Many women still feel fine at 4 weeks, but others may notice sore breasts, fatigue, frequent urination, and nausea.
1 Nausea and vomiting, sometimes known as  morning sickness  typically begins in the 2nd to 8th week of pregnancy. 2  Other possible early pregnancy symptoms are mood swings, fatigue, changes in skin pigmentation, frequent urination, and headache. Not all women will experience the same symptoms in early pregnancy or experience these symptoms to the same degree. 2  Feelings of breast swelling, tenderness, or pain are also commonly associated with early pregnancy. 3  There is usually only a small amount of weight gain in the first trimester of pregnancy.