an erosional scar on the earth’s surface, produced by the impact of a cosmic body, as a meteorite or asteroid.
Compare (def 2).
a mark on the earth’s surface, usually circular, formed by a large ancient meteorite impact
1961, from astro- + Greek bleme “throw of a missile; wound caused by a missile,” from ballein “to throw” (see ballistics).
astroblastoma astroblastoma as·tro·blas·to·ma (ās’trō-blā-stō’mə) n. A poorly differentiated tumor composed of astrocytes and arranged radially with short fibrils terminating on small blood vessels. Also called grade II astrocytoma, grade III astrocytoma.
noun the branch of botany that investigates the possibility that plants grow on other planets
a branch of astronomy and dealing with the chemical composition and evolution of the universe and its parts. noun the study of the chemistry of celestial bodies and space, esp by means of spectroscopy
- Astra digital radio
astra digital radio audio Digital Radio over satellite, compatible with analog television transmissions. Alternatively the normal TV subcarriers can be modulated by a MPEG-1 Layer-2 48 kHz 192 kbps signal. Quality is better than analog carriers and only needs half the bandwidth (analog stereo = 2 carrier, digital stereo = 1 carrier). Quality is limited […]