nova 音标拼音: [n'ovə]
n . 新星
新星
nova n 1 :
a star that ejects some of its material in the form of a cloud and become more luminous in the process Nova \
No "
va \ (
n [=
o ]"
v [.
a ]),
n .;
pl .
L . {
Novae } (
n [=
o ]"
v [=
e ]),
E .
{
Novas } (
n [=
o ]"
v [.
a ]
z ). [
L .,
fem .
sing .
of novus new .]
(
Astron .)
A star which suddenly increases in brightness thousands of times ,
then fades back to near its original intensity .
It may appear as a "
new "
star if its original brightness was too low for routine observation .
A star which suddenly increases in brightness to many millions of times its original intensity is a {
supernova },
and the postulated mechanisms for the increases of brightness of novae and supernovae are different .
Note :
The most important modern novae are :
{
No "
va Co *
ro "
nae Bo `
re *
a "
lis }[
1866 ];
{
No "
va Cyg "
ni }[
1876 ];
{
No "
va An *
dro "
me *
dae }[
1885 ];
{
No "
va Au *
ri "
gae }[
1891 -
92 ];
{
No "
va Per "
se *
i }[
1901 ].
There are two novae called {
Nova Persei }.
They are :
(
a )
A small nova which appeared in 1881 .
(
b )
An extraordinary nova which appeared in Perseus in 1901 .
It was first sighted on February 22 ,
and for one night (
February 23 )
was the brightest star in the sky .
By July it had almost disappeared ,
after which faint surrounding nebulous masses were discovered ,
apparently moving radially outward from the star at incredible velocity .
[
Webster 1913 Suppl .
PJC ]
40 Moby Thesaurus words for "
nova ":
Beehive ,
Cepheid variable ,
Hertzsprung -
Russell diagram ,
Hyades ,
Messier catalog ,
NGC ,
Pleiades ,
Seven Sisters ,
absolute magnitude ,
binary star ,
black hole ,
double star ,
dwarf star ,
fixed star ,
giant star ,
globular cluster ,
gravity star ,
magnitude ,
main sequence star ,
mass -
luminosity law ,
neutron star ,
open cluster ,
populations ,
pulsar ,
quasar ,
quasi -
stellar radio source ,
radio star ,
red giant star ,
relative magnitude ,
sky atlas ,
spectrum -
luminosity diagram ,
star ,
star catalog ,
star chart ,
star cloud ,
star cluster ,
stellar magnitude ,
supernova ,
variable star ,
white dwarf star A {minicomputer }(?) introduced by {Data General }
in 1969 , with four 16 -bit {accumulators }, AC0 to AC3 , and a
15 -bit {program counter }. A later model also had a 15 -bit
stack pointer } and {frame pointer }. AC2 and AC3 could be
used for {indexed addressing } and AC3 was used to store the
return address on a {subroutine } call . Apart from the small
register set }, the NOVA was an ordinary {CPU } design .
Memory could be accessed indirectly through addresses stored
in other memory locations . If locations 0 to 3 were used for
this purpose , they were auto -incremented after being used . If
locations 4 to 7 were used , they were auto -decremented .
Memory could be addressed in 16 -bit words up to a maximum of
32K words (64K bytes ). The instruction cycle time was 500
nanoseconds }(?). The Nova originally used {core memory },
then later {dynamic RAM }.
Like the {PDP -8 }, the {Data General } Nova was also copied , not
just in one , but two implementations - the {Data General
MN601 } and {Fairchild 9440 }. Luckily , the NOVA was a more
mature design than the PDP -8 .
Another CPU , the {PACE }, was based on the NOVA design , but
featured 16 -bit addresses (instead of the Nova 's 15 ), more
addressing modes }, and a 10 -level {stack } (like the {Intel
8008 }).
Speed , mini ?]
2003 -10 -23 )
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