Examlex
The escape speed at the event horizon of a black hole is c, 300,000 km/sec.
Atrial Septal Defect
A congenital heart defect characterized by an opening in the atrial septum, allowing blood to flow between the two atria, which can affect blood circulation.
Down Syndrome
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
Congenital Heart Defects
Heart abnormalities that are present at birth, affecting the structure and function of the heart.
Amniocentesis
A medical procedure involving the extraction of a small amount of amniotic fluid for testing, typically to diagnose genetic disorders in a fetus.
Q3: The Local Group of galaxies spans about
Q31: According to the ages of the globular
Q35: Neutral hydrogen can be detected because its
Q36: Any main- sequence star over 25 solar
Q45: Cygnus X- 1 was discovered because it
Q63: Compared to our Sun, a typical white
Q94: For measuring the distances to galaxies within
Q125: William Herschel's original model for our Galaxy
Q137: Shapley found the globular cluster distribution equally
Q152: We find most stars still on the