H-function

H I Region

H II Regions

Haag, Rudolf

Haag-Lopuszanski-Sohnius theorem

Haag's theorem

Haania

Haaniella

Haaniella erringtoniae

Haaniinae

* Haar, Alfréd

Haar Functions

Haas, Walter Henry

Habanocnus

Haber, Fritz

• stamp

Haberma

Habia

Haborophocoena

Habracanthus

Habrocerinae

Habrocerus

Habrochloa

Habrolinus

Habromys

Hadamard Jacques

Hadromys humei
Hadromys loujacobsi

Habrona

Habrosyne

* Hachette, Jean

Hackeriella

* Hadamard, Jacques

Haddadus binotatus

Hadeninae

Hades

Hadley, George

* Hadley, John

Hadrobregmini

Hadrodontes

Hadromys

Hadromys humei
Hadromys loujacobsi

Hadron

Hadronyche modesta

Hadropinus

Hadrothemis

Hadzioidea

Haemactis

Haemantheae

Haemanthus

Haemanthus albiflos
Haemanthus coccineus
Haemanthus pubescens

Haemateulia

Haematoderus

Haematopodidae

Haematopus ostralegus

Haematospiza

Haemodoraceae

Haemomaster

Haemonides

Haeromys

Haetera

Haetera piera

Haeterini

* Hall, Marshall Jr.
* Hall, Philip

Haller, Albrecht von

* Halley, Edmond

Halley's Comet

Hallianthus

Hallicarnia

Hallomeninae

Hallomenus binotatus

Halm, Jacob Karl Ernst

Halmus

* Halmos, Paul

Halobaena

Halocordylidae

Halocorynidae

Halocynthia papillosa

Halogen bond

Halomitra

Halophilosciidae

Halophytaceae

Halopterididae

Halopyrum

Haloragaceae

Halosbaena

Halosbaenidae

* Halphen, George
* Halsted, George

Halton sequence

Halyzia sedecimguttata

* Hamel, Georg

Hamelia axillaris

Hamelieae

* Hamill, Christine

Hamilton, James Archibald

* Hamilton, William

Hamilton, William

Hamilton William Rowan

Hamilton-Jacobi theory
Hamilton numbers
Hamilton polygons
Hamilton's principle

Hamilton Quarry

Hamiltonian mechanics

* Hamming, Richard W

Hanbury Brown, Robert

Hanguanaceae

* Hankel, Hermann

Hankel functions

Hanleya

Hanleyidae

Hanleyella

Hänsch Theodor W.

Hansenolana

Hansen, Peter Andreas

Hansen, William W.

Hanski, Mikko

Hanson, (Emmeline) Jean

Hansteen, Christopher

Hansteinia

Hapalemur

Hapaloides

Hapalomys

Hapalops

Hapalops ruetimeyeri

Hapalopsittaca

Hapaloptila

Haplaraeidae

Haplochelidon

Haplochromis

Haplodendron

Haplogynae

Haplomesus

Haplomunna

Haplomunnidae

Haploniscidae

Haploniscus

Haplonycteris

Haploops

Haplophaedia

Haplopygus

Haplorrhini

Haplotaxida

Hapsidophrys

Haptogenys

Haptolana

Haramiyida

Harden, Arthur

* Hardie, Patrick
* Hardie, Robert

Harding, Karl [Carl ] Ludwig

Hardness scales

* Hardy, Claude

Hardy, Eduardo

Hardy, Godfrey Harold
* Haret, Spiru

• Stamp

Haridatta I

* Harish-Chandra

Harkness, William

Harpachne

Harpactes

Harpactes ardens
Harpactes diardii
Harpactes duvaucelii
Harpactes erythrocephalus
Harpactes fasciatus
Harpactes kasumba
Harpactes mackloti
Harpactes oreskios
Harpactes orrhophaeus
Harpactes reinwardtii
Harpactes wardi
Harpactes whiteheadi

Harpagiferidae

Harpagophoridae

Harpagus

Harpagus bidentatus
Harpagus diodon

Harpasus

Harper, William Edmund

Harperocallis flava

Harpia

Harpides grimmi

Harpiinae

Harpochilus

Harpochloa

Harpyhaliaetus

Harpyopsis

Harrimanelloideae

Harrington, Robert G.

Harrington, Robert Sutton

* Harriot, Thomas

Harrisia

Harrisia balansae
Harrisia brookii
Harrisia eriophora
Harrisia fragrans

Harrisomyia

Harrison, Edward

Harrison, John

Harrison-Zeldovich spectrum

Hartebeesthoek Radio Astronomy Observatory (HartRAO)

* Hartley, Brian

Hartle-Hawking state

Hartle-Hawking vacuum

Hartley Transform

Hartmann, Johannes Franz

Hartman effect

Hartmaniellidae

Harteck, Paul

Hartliebia

Hartree, Douglas

Hartree-Fock

Hartwig, Carl Ernst Albrecht

Harvard-Smithsonian Center for Astrophysics

Harvey, William

Harveyope

Hasariinae

* Haselgrove, Brian
* Hasib Abu Kamil al

Hasora

* Hasse, Helmut

Hassiavis laticauda

Hassium

Hasteulia

Hat Creek Radio Observatory

Hat Matrix

Hatanaka, Takeo

Hathliacynidae

Hati

* Hatvani, István
* Hau, Lene

Haumea (dwarf planet)

Hausdorff, Felix

Hausdorff-Bescovitch dimension

Hausdorff paradox

Hausmannite

Haüy, René Just

Hawaianira

Hawking StephenWilliam

Hawking radiation

Hawking temperature

Hawkins, Gerald

Haworth, Walter Norman

Haworthia

Haworthia cymbiformis
Haworthia fasciata
Haworthia limifolia

* Hay, Louise

Hay, William Thomson

Hayashi, Chusiro

Hayashi Izuo

* Hayes, Ellen

Haystack Observatory

* Hazlett, Olive
* Haytham, Abu Ali al